Beelzebub 1295

This one struck me as being something of a mixed bag, some very easy clues along with some very unfamiliar answers.

Most of the entries I had come across before but some (31ac, 11dn & 16dn to name but three) were new to me (and, I suspect, to most other solvers).

Across
1 Hardening resistance, though repressed by sulk, liable to erupt (12)
PETRIFACTIVE – R (resistance) IF (though) in (repressed by) PET (sulk) ACTIVE (liable to erupt)

9 Foolish once in middle of stunt near whirlpool, ignoring depth (6)
UNREDY – [st]U[nt] (middle of stunt) NR (near) ED[d]Y (whirlpool, ignoring depth)

10 Increasing strength and weight in command (5)
TONIC – TON (weight) IC (in command)

13 Stop constant liar, disturbed by denial (7)
CLARINO – C (constant) plus an anagram (disturbed) of LIAR plus NO (denial)

14 Record corruption in little league (8)
PROTOCOL – ROT (corruption) in POCO (little) L (league)

15 Bar to get round in rapid movement (6)
LOUNGE – O (round) in LUNGE (rapid movement)

17 Tattered clothing in riotous festivities (4)
RAGS – double def.

19 Verses oddly airy about losing love (8)
RUBAIYAT – an anagram (oddly) of AIRY AB[o]UT

20 Bitterness reflected in support for plunderer (8)
PILLAGER – GALL (bitterness) reversed (reflected) in PIER (support)

23 Add, apart from kiss, woman’s name (4)
ANNE – ANNE[x] (add, apart from kiss)

24 Turned about with particular energy, causing vomiting (6)
EMETIC – C (about) ITEM (particular) E (energy) reversed (turned)

26 Case disrupted by further caprice (8)
HUMORESK – HUSK (case) around (disrupted by) MORE (further)

28 Grass mostly around shrub with tendrils (7)
CIRROSE – RIC[e] (grass mostly) reversed (around) ROSE (shrub)

29 Experienced American lecturer of great depth (5)
HADAL – HAD (experienced) A (American) L (lecturer)

30 Sun lotion for habitual user (6)
STONER – S (sun) TONER (lotion)

31 Poor one, say, merely dependent on charity (12)
ELEEMOSYNARY – an anagram (poor) of ONE SAY MERELY

Down
1 Fine passage in place breaking bad chapter up (6,5)
PURPLE PATCH – PL (place) in (breaking) an anagram (bad) of CHAPTER UP

2 Test performance in yacht initially surrounded by fish (6)
TRY-OUT – Y[acht] (yacht initially) in (surrounded by) TROUT (fish)

3 Settle scores through cases (4)
REST – hidden in (cases) ‘scoRES Through’

4 Symbolic character frenzied amid gore (8)
IDEOGRAM – an anagram (frenzied) of AMID GORE

5 Apparently see doctor for assurance (6)
APLOMB – AP (apparently) LO (see) MB (doctor)

6 Dry river I cross to catch yellow moth (7)
TORTRIX – TT (dry) R (river) I X (cross) around (to catch) OR (yellow)

7 Protuberances coming from odd parts of aliens if overturned (4)
INIA – A[l]I[e]N[s] I[f] (odd parts of aliens if) reversed (overturned)

8 Rather sour knight in struggle glaring (10)
VINEGARISH – N (knight) in VIE (struggle) GARISH (glaring)

11 Saint beset by ridicule supporting firm censorship (11)
COMSTOCKERY – CO (firm) plus ST (saint) in MOCKERY (ridicule)

12 Local itinerant endlessly restricted by secular power from the south (10)
PROVINCIAL – ROVIN[g] (itinerant endlessly) in (restricted by) LAIC (secular) P (power) reversed (from the south)

16 Damage old pen in office of governor (8)
HARMOSTY – HARM (damage) O (old) STY (pen)

18 Regret going up in aircraft without new side-pieces (7)
PLEURAE – RUE (regret) reversed (going up) in PLA[n]E (aircraft without new)

21 Strict one stops exuberant enjoyment (6)
GIUSTO – I (one) in (stops) GUSTO (exuberant enjoyment)

22 Bones in tail absent (6)
STERNA – STERN (tail) A (absent)

25 Seed, European having points (4)
URDÉ – URD (seed) E (European)

27 Strip in Scotland? Putting tee on it could make golf course there (4)
ROON – adding a T (tee) to the front gives Troon (a golf course in Scotland)