Complete
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1 9 11 15 21 23 12 2 16 3 13 4 8 10 17 22 24 5 18 6 19 14 7 20
  1. 1a Perfunctory wash (informal) (7)
  2. 8a Woodwind players (7)
  3. 9a Maybe (7)
  4. 10a Not clear (7)
  5. 11a Nitwit (informal) (5)
  6. 13a One of two US presidents (9)
  7. 15a Reverse or modify a previous opinion (4-5)
  8. 18a Stone with coloured bands (5)
  9. 21a Radioactive element used in nuclear reactors — trio hum (anag) (7)
  10. 22a Able and willing to adjust to new conditions (7)
  11. 23a Letter (from St Paul?) (7)
  12. 24a Signified (7)
  13. 1d Drop dead (informal) (3,2)
  14. 2d Quorum for a crowd? (5)
  15. 3d I appear on trip (anag) — wrong (13)
  16. 4d Pristina is its capital (6)
  17. 5d Leo, for example (13)
  18. 6d Guarantee (6)
  19. 7d State categorically (6)
  20. 12d Steady on there! (4)
  21. 14d Remaining (4)
  22. 15d Edible fat emulsion — fighter who uses his head? (6)
  23. 16d American biscuit (6)
  24. 17d Discarded (6)
  25. 19d Scope (5)
  26. 20d Revise and/or correct (5)