Complete
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1 8 10 15 17 21 23 2 12 18 3 13 9 19 4 24 5 11 20 22 6 14 7 16
  1. 1a Sudden, surprise attack (6)
  2. 4a Wheel’s cover (6)
  3. 8a Elite squad (5)
  4. 9a Humourless (2-5)
  5. 10a Barnum, perhaps (7)
  6. 11a Vast expanse (5)
  7. 12a It’ll unlock several doors (6,3)
  8. 17a Hold on tight (to something or someone) (5)
  9. 19a Eight-sided shape (7)
  10. 21a Speedy service (7)
  11. 22a Relish – impertinence (5)
  12. 23a Evolve (6)
  13. 24a Strength of character (6)
  14. 1d Hold responsible (for wrongdoing) (6)
  15. 2d Place to retire to? (7)
  16. 3d Old engine driver? (5)
  17. 5d Dismiss from the priesthood (7)
  18. 6d It stores data on a computer (5)
  19. 7d One’s obsessed with tiny details (6)
  20. 9d Proud one’s (anag) – dull and slow (9)
  21. 13d Orange bit (7)
  22. 14d Result of adding bacteria to milk (7)
  23. 15d (A) hoot – or yell (6)
  24. 16d Sign of a cold or hay fever (6)
  25. 18d Enter information to a computer (5)
  26. 20d Liking – a morsel (5)