Complete
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1 8 10 13 17 21 24 2 18 3 12 11 4 16 22 14 5 9 20 19 6 15 7 23
  1. 1a Musical notation indicating the number of beats to a measure (4,9)
  2. 8a In Samuel Taylor Coleridge's epic 1798 poem he was 'ancient' (7)
  3. 9a Showing signs of wear and tear (5)
  4. 10a One dollar (informal) (4)
  5. 11a Straw broad-brimmed hat — robs more (anag) (8)
  6. 13a Hooded waterproof jacket (6)
  7. 14a Poor densely populated city area (6)
  8. 17a Lamp oil (8)
  9. 19a Hee-haw (4)
  10. 21a Easy (5)
  11. 22a Lock-securing mesh? (7)
  12. 24a Jokes about painful subjects (7,6)
  13. 1d Feline fellow? (3)
  14. 2d African country independent since 1956, previously a French protectorate (7)
  15. 3d Transport (4)
  16. 4d One of three monsters, sisters with sharp fangs and hair of venomous snakes (6)
  17. 5d European motorway — a NATO hub (anag) (8)
  18. 6d Free (5)
  19. 7d Study of word development (9)
  20. 10d Jolly Roger (5,4)
  21. 12d Artificially high singing tones (8)
  22. 15d Canada's largest city (7)
  23. 16d Parts of a foot (6)
  24. 18d Imperial (5)
  25. 20d Location in France (4)
  26. 23d Prominent rock on a hill (3)