Complete
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1 9 12 13 17 20 22 11 2 18 3 23 4 10 16 14 8 21 5 6 15 7 19
  1. 1a Extreme (8)
  2. 5a Spineless creature (4)
  3. 9a American pie (5)
  4. 10a Very protective (7)
  5. 11a Specifically (12)
  6. 13a Sets aside (6)
  7. 14a Connecting punctuation mark (6)
  8. 17a Rags-to-riches tale (7,5)
  9. 20a Skin around a nail (7)
  10. 21a Pre-eminent (5)
  11. 22a Reverberate (4)
  12. 23a Immaculate (8)
  13. 1d Bitter flavouring (4)
  14. 2d Uninhabited granite island in the North Atlantic (7)
  15. 3d Nicest county (anag) – area represented by a British MP (12)
  16. 4d Spurn (6)
  17. 6d Distinctive smell (5)
  18. 7d Walking slowly (8)
  19. 8d London medical district (6,6)
  20. 12d Attack in which many are killed (8)
  21. 15d Brave woman (7)
  22. 16d Napping (6)
  23. 18d See – the ball game (5)
  24. 19d More alternative? (4)