A good, fair puzzle. Thanks, Peto (love the name, by the way).

Across | ||
1 | DECAMP |
Split in Democratic party over the onset of Europhobia (6)
D for Democratic plus E, the first letter of Europhobia plus CAMP, a faction or party |
4 | WALLER |
Fighting to include lines by European poet (6)
WAR with LL for lines and E for European inserted. We presume the poet concerned is Edmund Waller (the writer of Go, Lovely Rose), but it could also be Robert Waller, a much more recent poet. |
8 | COLDISH |
Somewhat chilly and quiet after last couple leave POW camp (7)
COLDI (Colditz minus the last couple of letters) plus SH for quiet. |
9 | ENCHANT |
Delight in French song (7)
EN (French for in) plus CHANT (song) |
11 | HEAVY METAL |
Have May let Dicky lead perhaps (5,5)
An anagram (dicky) of Have May let |
12 | VIAL |
Sassoon loses top of disinfectant bottle (4)
The celebrity crimper Vidal Sassoon minus D, the first letter of disinfectant |
13 | SHRED |
Republican cuts get rid of a small amount (5)
R for Republican inserted into SHED, dispose of |
14 | TURGENEV |
Press baron finally introduced to left-leaning screen writer (8)
URGE (press) plus N (final letter of baron) in TEV (vet, or screen, backwards or left-leaning) |
16 | BAR CHART |
It shows comparative amounts of bass and troutlike fish caught by trickery (3,5)
B for bass plus ART (trickery) with CHAR (a trout-like fish) inserted. |
18 | CAMEL |
Train traveller arrived at Malmo Central (5)
CAME (arrived) plus the middle letter of Malmo. Think camel train. |
20 | REAR |
Miserable daughter left behind (4)
Drear minus d for daughter. We liked this one. |
21 | COR ANGLAIS |
Carol sang and I played an instrument (3,7)
An anagram of Carol, sang and I |
23 | CROONER |
In Norfolk town working for Miles as a singer (7)
Cromer (you can bet the Norfolk town will be Cromer or Diss in crosswords) with the m for miles replaced by on (working) |
24 | AINTREE |
Excellent books about England’s earliest racecourse (7)
AI (excellent) plus NT (New Testament or books) plus RE (concerning) plus E (first letter of England) |
25 | MASKED |
What Zorro was requested to answer after mass (6)
M for mass plus asked (requested) |
26 | DETAIL |
Small part from the East German song about thanks (6)
DEIL (a reversal or from the East of Lied, the German word for song) with Ta ot thank you inserted |
Down | ||
1 | DRONE |
Extremely dapper – the same as Bingo Little for example (5)
DR (the extreme letters of dapper) plus ONE as in one and the same. Bingo was Bertie Wooster’s chum and fellow-member of the Drones Club. |
2 | CADAVER |
Stiff clergyman upset after cocaine is found on girl (7)
C for cocaine plus ADA, a girl, plus VER (Rev backwards or upset). “Stiff” is criminal argot for a dead body. |
3 | MASS MEDIA |
Academic dispute missed by American newspapers for instance (4,5)
An anagram of MA (an academic) plus MISSED plus A for American |
5 | ANNUL |
Girl meeting Quilp oddly neglected to cancel (5)
The girl is ANN. The even letters of Quilp are U and L (oddly neglected). |
6 | LE HAVRE |
Port Vale hero failing to finish surprisingly (2,5)
An anagram of Vale and Hero (without its final letter o) |
7 | RING A BELL |
Stream outside oddly began to sound familiar (4,1,4)
An anagram of began placed inside RILL (a stream). |
10 | STATUTORY |
Teacher involved in check required by law (9)
Tutpr (teacher) placed inside Stay (check). |
13 | SNARE DRUM |
Rub out answer about recipient of beating (5,4)
Murder (rub out) plus ANS(answer) all reversed. |
15 | RECONDITE |
Little known version of eastern doctrine (9)
An anagram of E (eastern) plus doctrine. |
17 | CURIOUS |
Unusual when a scoundrel promises to pay (7)
Cur (scoundrel) plus IOUS (I owe you notes or promises to pay). |
19 | MILITIA |
I follow it during training of Mali reservists (7)
IT followed by I placed inside an anagram of Mali. |
21 | CREPE |
Evident in mediocre performer’s material (5)
Hidden (or evident) within mediocre performer’s. |
22 | IDEAL |
Perfect piece of imitation wood (5)
I for imitation plus Deal (wood) |
Thanks all three.
LOI was Turgenev, which left me ashamed as he is one of my favourite writers.