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 Permit to do something (6)
  2. 4a Potential oaks? (6)
  3. 8a Put down on paper (5)
  4. 9a Dominance (7)
  5. 10a Vehicle seen on the roads in wintery conditions (7)
  6. 11a Synthetic silk-like fabric (5)
  7. 12a Bogus trap (anag) — somewhere good to eat and drink? (9)
  8. 17a Ghastly (5)
  9. 19a Convey (7)
  10. 21a Out of order — erratic (7)
  11. 22a Cause of computer failure? (5)
  12. 23a One suffering for their beliefs (6)
  13. 24a Very dull (6)
  14. 1d Hauling something with a rope (6)
  15. 2d Nauseating (7)
  16. 3d Happening (5)
  17. 5d Twitter (7)
  18. 6d All set to go (5)
  19. 7d Proverb (6)
  20. 9d Game bird (9)
  21. 13d In a suave way (7)
  22. 14d Largest German state, home of BMW cars (7)
  23. 15d Six feet down? (6)
  24. 16d Worthless (6)
  25. 18d Entrance hall (5)
  26. 20d Beau (5)