Complete
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1 9 11 15 21 23 12 2 16 3 13 4 8 10 17 22 24 5 18 6 19 14 7 20
  1. 1a Big win! (7)
  2. 8a Let go (7)
  3. 9a More flamboyant — enthusiast (7)
  4. 10a Square of rich chocolate cake (7)
  5. 11a Cathy (anag) (5)
  6. 13a Clean with a compressed air jet (9)
  7. 15a Language invented by a Pole in 1887 — no repeats (anag) (9)
  8. 18a Siberian city, founded by Tsar Boris Godunov in 1604 (5)
  9. 21a Reduce in worth (7)
  10. 22a Unending (7)
  11. 23a Illustrious (7)
  12. 24a Muslim women's veil (7)
  13. 1d Moment (5)
  14. 2d Rounded and pointed (5)
  15. 3d Colour remover (5,8)
  16. 4d Headdress (6)
  17. 5d 1983 Willy Russell musical (5,8)
  18. 6d Eye part (6)
  19. 7d Atacama, for example (6)
  20. 12d Coalition led by Germany, with Italy and Japan, in WWII (4)
  21. 14d Lather (4)
  22. 15d Deliberately avoid (6)
  23. 16d Full of romantic imagery (6)
  24. 17d Cardinal number (6)
  25. 19d Musical note (5)
  26. 20d Prosperous peasant farmer in pre-Stalinist Russia (5)