ACROSS
1. Tick – double definition.
3. Armchair – piece of furniture. Church (CH) collected by member (ARM) and look (AIR – in the sense of has a look of – has an air of).
8. Knees up – lively party. Joint’s (KNEES), at an end (UP).
10. Actor – player. Agent f(ACTOR) overlooking (missing) fine (F).
11. Bitter lemon – drink. Beer (BITTER), anagram (possibly) of ON ME after pol(L).
13. Castle – keep. Left (L) in station (CASTE). Caste as defined by ‘any social class or system based on such distinctions as heredity, rank etc’ – as in station in life.
15. Scrape – tight corner. Waste (SCRAP), energy (E).
17. Money for jam – easy pickings. Anagram (excited) of ON MY FARM JOE.
20. B and B – guesthouse. Ring (BAND), bishop (B).
21. At least – if nothing else. Finally (AT LAST) consuming (E)ggs.
22. Lancelot – legendary knight. (Knight’s) weapon, item at auction (LOT).
23. I Spy – children’s game. Th(IS PY)ramid.
DOWN
1. Take back – return. Accept (TAKE), support (BACK).
2. Cheat – fiddle. Talk (CHAT) around valuabl(E).
4. Ripple – little wave. Penny (P) in an anagram (at sea) of PERIL.
5. Charm school – cryptic definition.
6. Antenna – aerial. Social worker (ANT), girl (ANNE) upwards/backwards.
7. Rare – seldom seen. King (R), anagram (deformed) of EAR.
9. Spelling bee – competition. Pun on magician and spells.
12. Geometry – maths subject. For example – e.g upset (GE), anagram (badly) of TROY ME.
14. Simenon – French novelist. Is turned upside down (SI), guys (MEN), against (ON as in resting on). The novelist was only vaguely familiar to me but rose out of the memory given the clueing.
16. Dynamo – energetic type. S(O MANY D)uties – all upwards.
18. Jeans – article of clothing. Short joke (JES)t around article (AN). A 15×15 may have left out the extra ‘article’ in the clue.
19. Abel – murder victim. Lincoln (ABE), lake (L).
Edited at 2016-06-28 08:53 am (UTC)
Brian