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 Musically arranged (12)
  2. 9a Part of a step (5)
  3. 10a Decisive (7)
  4. 11a River (which is originally blue and white) (4)
  5. 12a Muddled (8)
  6. 14a Shallow trench made by a plough (6)
  7. 15a Expressed (6)
  8. 18a Suspenseful (8)
  9. 20a Worry unnecessarily (4)
  10. 22a Liberate (7)
  11. 23a Winged insect — amigo (anag) (5)
  12. 24a Agent that destroys bacteria (12)
  13. 2d Cattle thief (7)
  14. 3d Rent (4)
  15. 4d Private soldier in the Royal Engineers (6)
  16. 5d Studying just before an exam (8)
  17. 6d Carried (something heavy) (5)
  18. 7d Ruin (12)
  19. 8d Metamorphosed (12)
  20. 13d Grizzle (8)
  21. 16d Indisputable (7)
  22. 17d Audible and uncontrolled expulsion of air through the nose (6)
  23. 19d Wastes time (5)
  24. 21d Fissure in something (4)