Complete
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7 14 19 1 9 12 21 2 15 3 11 20 10 4 18 16 5 8 13 6 17
  1. 1a Astoundingly huge (10)
  2. 7a Hairdressers (8)
  3. 8a Go wrong (4)
  4. 9a Counterfeit (4)
  5. 10a Glazed biscuit shape of a loose knot (7)
  6. 12a Exploit (11)
  7. 14a Become popular (5,2)
  8. 16a Moolah (slang) (4)
  9. 19a Forbid outright (4)
  10. 20a Drink to whet the appetite (8)
  11. 21a As things turned out (2,3,5)
  12. 1d Satisfies — asset (anag) (5)
  13. 2d Let go (7)
  14. 3d As an alternative (4)
  15. 4d Renegade (8)
  16. 5d Out of shape (5)
  17. 6d Take in (6)
  18. 11d War memorial (8)
  19. 12d Eased (6)
  20. 13d Arousing intense feeling (7)
  21. 15d Sing like Bing (5)
  22. 17d Lifting tackle (5)
  23. 18d Narrow wooded valley (4)