Complete
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8 9 11 14 18 22 24 1 2 19 3 13 12 4 10 17 15 5 21 23 20 6 16 7
  1. 1a Cornucopia (4,2,6)
  2. 9a Out of condition (5)
  3. 10a Funny drawing (7)
  4. 11a Tiny particle (4)
  5. 12a Excessively fast (like some New Testament swine?) — a grandee (anag) (8)
  6. 14a More likely than not (4-2)
  7. 15a New (6)
  8. 18a Volcanic Indonesian island, mostly destroyed by eruption in 1883 (8)
  9. 20a Saintly circle (4)
  10. 22a North American river known for its waterfalls (7)
  11. 23a Edible entrails (5)
  12. 24a Not sensitive to criticism (5-7)
  13. 2d For use on trails, beaches etc, like a mountain bike or Jeep (3-4)
  14. 3d Short message (4)
  15. 4d Beauty treatment (6)
  16. 5d Region of north-east France (8)
  17. 6d Not a single person (2,3)
  18. 7d Traditional song and nursery rhyme, which predates the American Revolution (the state anthem of Connecticut) (6-6)
  19. 8d Shut up! (3,1,4,2,2)
  20. 13d Native American fighting axe (8)
  21. 16d Get hold of quickly (7)
  22. 17d Return (2,4)
  23. 19d Italian violin maker, d. 1684 (5)
  24. 21d West Germany's capital — Beethoven's birthplace (4)