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 Sound unit (7)
  2. 8a Faze (7)
  3. 9a Shout out (7)
  4. 10a Utter (a word?) (7)
  5. 11a Very small piece (of anything) (5)
  6. 13a Shocking — Icarus, too (anag) (9)
  7. 15a Con artist (9)
  8. 18a Corrodes (5)
  9. 21a One more (7)
  10. 22a Kind of rock produced under intense heat (7)
  11. 23a Totally disorganised (7)
  12. 24a E in the Greek alphabet (7)
  13. 1d The worst of the worst? (5)
  14. 2d Items of the same type stored in a hidden place (5)
  15. 3d Involving clearly defined and opposing principles (5,3,5)
  16. 4d Move clumsily (6)
  17. 5d Suppressed implicit meanings in an utterance (13)
  18. 6d Small attractive cave (6)
  19. 7d Small space set into a wall (6)
  20. 12d Couple (4)
  21. 14d Single thing (4)
  22. 15d Husband-to-be (6)
  23. 16d Obsessive nerd (informal) (6)
  24. 17d Three times (6)
  25. 19d Frown with displeasure (5)
  26. 20d Girl's name (one can be lazy!) (5)