Cryptic crossword No 2,235

Across

1. Complex dirge embodying last laments firstly questioned... (7)
2. ...Oxford Blue perhaps, by unkempt beeches without British... (6)
3. ...snack for your good health, that is! (7)
4. Size of packet given by very large piece? (7)
5. Type of bar food following wedding (9)
6. With no delay, from the East, Nagaland's removing date from their food? (5)
7. Strikebreaker helps King out in revolution (4)
8. Intrusive ad for quirky card? (3-2)
9. Feast maybe alternately part of witches' cursed AGM (3,5)
10. Time after time, heads for cheap items (3)
11. Filling in an initialism usually transfers to accentuable motto (5,7,6)
12. Run after worker for pint? (4)
13. It could make you weep when I interrupt working with no backing (5)
14. Informally complain about complaint? (9)
15. See 23
16. Saw expert part of speech (7)
17. See 23
18. Sailor: warning daughter, filling stomach (7)

Down

1. Literary figure manages to translate English into Arabic at first (6)
2. Backfiring blitzkrieg amicably acquired picture (5)
3. Set for corruption after changing sides (3)
4. We're told moisture arrives soon (3)
5. Frozen body to recover consciousness shortly? (5)
6. Urge to appear before one's face in American Maxim? (3,2)
7. Member of deadly triad drunk rum in base (9)
8. Small portion of claret sates revolutionary (6)
9. Typical drunken fare from bloke babbling (5)
10. Jelly snake I initially consume (5)
11. Halves fixed unit cost with... (4,2,3)
12. ...committee putting energy into rough plan (5)
13. Procedure after troublemaker served up meal -- in the Deep South (2-3)
14. Promenade is road to flatten (6)
15. Jacob's eldest oddly rueful over British-European negotiations at first (6)
16. And yes - in Germany, head to centre for sausage! (5)
17. One upper-class bachelor turns good in Spain (5)
18. See 20a
19. Ring left away from object found in fairy-tale bed? (3)
20. Ex fooled every so often (3)