Complete
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1 9 11 15 17 21 25 2 12 3 13 20 24 26 4 18 5 16 19 14 8 10 22 6 23 7
  1. 1a It helps drivers to avoid accidents (4,5)
  2. 8a ___ Wintour, editor-in-chief of Vogue since 1988 (4)
  3. 9a Careful footwork? (9)
  4. 10a Very — large — epic (informal) (4)
  5. 13a Want what someone else has (5)
  6. 15a Place for bees (6)
  7. 16a Close at hand (6)
  8. 17a Flockless shepherdess? (2-4)
  9. 19a Produce shoots (6)
  10. 20a Item of bed clothes (5)
  11. 21a Usual practice (4)
  12. 24a Official (or organisation) responsible for supervision of a particular activity (9)
  13. 25a Supports (4)
  14. 26a Statement added to or revising a proposal (9)
  15. 2d Starting point for darts players (4)
  16. 3d Diesel fuel (4)
  17. 4d Use (6)
  18. 5d Distress (6)
  19. 6d Without precedent (7,2)
  20. 7d They make things happen (9)
  21. 11d Severe skin abscess — clean curb (anag) (9)
  22. 12d Belittle — Degas pair (anag) (9)
  23. 13d Calls out (5)
  24. 14d Try to seduce (5)
  25. 18d Indifference — sputum (6)
  26. 19d Shiny decorative disc (6)
  27. 22d Friendly (4)
  28. 23d Showing signs of use (4)