Complete
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6 7 10 13 17 21 23 1 14 2 12 11 3 16 22 15 4 8 20 18 5 19 9
  1. 1a Piffle (5-5)
  2. 7a Hawaiian guitar whose name translates as 'jumping flea' (7)
  3. 8a Nutty eye colour? (5)
  4. 10a Far down (4)
  5. 11a Couch potato (8)
  6. 13a Bookworm? (6)
  7. 15a Souk (6)
  8. 17a Idealistic (8)
  9. 18a Listen! (4)
  10. 21a From a sultanate (5)
  11. 22a Horse man? (7)
  12. 23a Nobility (10)
  13. 1d Lavender (5)
  14. 2d Self-effacing, submissive (4)
  15. 3d Of a system where there's no turning back? (3-3)
  16. 4d Radical shake-up (8)
  17. 5d Antitank weapon (7)
  18. 6d Favourable exchange (4,3,3)
  19. 9d Love of a 13 across (10)
  20. 12d Diet nosh (anag.) (8)
  21. 14d Stir (7)
  22. 16d Ring (6)
  23. 19d Stem (5)
  24. 20d Not I (anag.) (4)