Complete
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7 9 16 17 20 22 1 12 13 2 18 3 10 23 8 11 21 4 14 19 5 15 6
  1. 1 a Boned side of fish (6)
  2. 4 a Extra amount that restores a former level (3-2)
  3. 7 a Sermonise (6)
  4. 8 a First event of a series (6)
  5. 9 a French military cap (4)
  6. 10 a Fashionable slogan (8)
  7. 12 a Taciturn (5-6)
  8. 17 a Progress by large jumps (8)
  9. 19 a Docile (4)
  10. 20 a Strong desire (6)
  11. 21 a Pushes forward (6)
  12. 22 a Nose rag (informal) (5)
  13. 23 a Under the influence of cannabis (6)
  14. 1 d Something surrendered as a penalty (7)
  15. 2 d First (7)
  16. 3 d Person organising things for others to see (9)
  17. 4 d November's birthstone (5)
  18. 5 d Tiny aperture (7)
  19. 6 d Display proudly (6)
  20. 11 d Spirit characteristic of an age (9)
  21. 13 d Modern Romance language (7)
  22. 14 d Taken advantage of (3-4)
  23. 15 d With little depressions in the cheeks (7)
  24. 16 d Fault in a system (6)
  25. 18 d Too cluttered with detail (5)

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