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 Accepted practice (6)
  2. 4a Type of shellfish (6)
  3. 8a Particular environment (5)
  4. 9a Matrimony (7)
  5. 10a Fraught with danger (7)
  6. 11a Drive back (5)
  7. 12a Daring (9)
  8. 17a Fire-raising (5)
  9. 19a Provide physical or mental relief — satisfy (7)
  10. 21a Heckle (7)
  11. 22a Warble (5)
  12. 23a Second version of film (6)
  13. 24a Deliberately stay clear of (6)
  14. 1d (Of the sea) a bit rough (6)
  15. 2d Region to which Russian and then Soviet governments sent those considered disloyal (7)
  16. 3d Surpass (5)
  17. 5d Cook too briefly (7)
  18. 6d Tread angrily (5)
  19. 7d Probable (6)
  20. 9d Ironic and/or witty quip (9)
  21. 13d Monarchy, a member of the European Union (7)
  22. 14d Abjectly subservient (7)
  23. 15d Hair trimmer (6)
  24. 16d Custard-coloured (6)
  25. 18d Play badly on a guitar (5)
  26. 20d Locations (5)