Complete
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1 9 11 14 21 22 24 17 2 15 8 18 3 4 12 23 5 10 16 19 25 6 20 7 13
  1. 1a Ballet dancer's skirt (4)
  2. 3a Using bad language (8)
  3. 9a Strong wind down the 20 valley (7)
  4. 10a Robinson Crusoe author (5)
  5. 11a Senior member of a group (5)
  6. 12a Despot (6)
  7. 14a I'm a notable nut (anag) — Cape Town feature (5,8)
  8. 17a Being nosy (6)
  9. 19a Rapidly becoming popular online (5)
  10. 22a Regions (5)
  11. 23a Tiresome (7)
  12. 24a Removed — mimicked (5,3)
  13. 25a Contradict (4)
  14. 1d Lack of assertiveness (8)
  15. 2d Irritable (5)
  16. 4d Esteemed (4,7,2)
  17. 5d Snake (like an abacus?) (5)
  18. 6d Spanish princess (7)
  19. 7d Scottish valley (4)
  20. 8d (Get a) tan (6)
  21. 13d British island known locally as Ynys Môn (8)
  22. 15d In a violent frenzy (7)
  23. 16d South-west US state (6)
  24. 18d Norwegian dramatist (5)
  25. 20d River running from the Swiss Alps to the Mediterranean (5)
  26. 21d Abstain from eating (4)