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 Quietest car ad (anag) – it's not an instant hit (8,5)
  2. 8a It'll fill a hole (7)
  3. 9a Cake embellishment (5)
  4. 10a Half a shandy (4)
  5. 11a Origin (8)
  6. 13a Barefoot (6)
  7. 14a Cheap and poor-quality (6)
  8. 17a Lucky charm (8)
  9. 19a Alice, brass or garage? (4)
  10. 21a Arabic term, origin 'decide a point of law' (5)
  11. 22a Bible readings (7)
  12. 24a An organisation's more extreme members (7,6)
  13. 1d Silly fool (3)
  14. 2d Sounds tremulous (7)
  15. 3d First Russian tsar (4)
  16. 4d Respect (6)
  17. 5d Final phase (8)
  18. 6d One might go off-piste (5)
  19. 7d Very observant (5-4)
  20. 10d Generous (9)
  21. 12d Fixed (8)
  22. 15d Coerce – a drongo (anag) (7)
  23. 16d Typically French (6)
  24. 18d Reveal (a secret) (3,2)
  25. 20d One's on drugs (4)
  26. 23d Person who must be obeyed? (3)