Complete
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1 8 10 13 16 20 22 2 3 9 19 17 4 15 14 5 12 11 6 21 7 18
  1. 1a One of over 100 circular masonry forts built to protect the English coast against the French (8,5)
  2. 8a Inn (3)
  3. 9a 1999 film starring Brad Pitt, Edward Norton and Helena Bonham Carter (5,4)
  4. 10a Sportier (anag) — characters in pantomime, usually with whitened faces (8)
  5. 11a Large quantity (4)
  6. 13a Failed to hit the mark (6)
  7. 14a Don't venture out (4,2)
  8. 16a Horse with, say, a chestnut coat mixed with white (4)
  9. 17a Ring it for advice (8)
  10. 20a Sign of the zodiac (9)
  11. 21a It's company! (3)
  12. 22a Rehydrate food (anag) — it's the usual practice (5,2,3,3)
  13. 1d Wipe clean (3,2)
  14. 2d Automatically approved (6-7)
  15. 3d Compelled (8)
  16. 4d Lungs of sheep, bullocks and pigs used in pet food (6)
  17. 5d Young children (informal) (4)
  18. 6d Impressively furnished (4-9)
  19. 7d Paul ___ , US bass singer and outspoken political activist, d. 1976 (7)
  20. 12d Only if it's really necessary (2,1,5)
  21. 13d Soft leather made originally from goatskin (7)
  22. 15d Send packing (3,3)
  23. 18d Tropical hardwood (5)
  24. 19d Coffin's support before burial (4)