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 Providing double security (4,3,6)
  2. 8a Farm vehicle (7)
  3. 9a Hold firmly (5)
  4. 10a Brewery product (4)
  5. 11a Rotary (8)
  6. 13a London rail terminus (6)
  7. 14a Deft (6)
  8. 17a Courgette (8)
  9. 19a South African currency (4)
  10. 21a Major's successor as PM (5)
  11. 22a Experienced sailors? (3,4)
  12. 24a Refrain from talking (6,4,3)
  13. 1d Binary digit (3)
  14. 2d Several (anag) — Brexiteers (7)
  15. 3d Play parts (4)
  16. 4d Author of The Descent of Man (6)
  17. 5d Killer of a king (8)
  18. 6d Go on all fours (5)
  19. 7d Distinguished — divided (9)
  20. 10d Prince of Darkness (9)
  21. 12d Philanderer (8)
  22. 15d Enjoying a winning streak (2,1,4)
  23. 16d International agency — no cues (anag) (6)
  24. 18d Nautical map (5)
  25. 20d Hamlet was one (4)
  26. 23d Fluid in a plant (3)