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 Activity (6)
  2. 4a Some way (6)
  3. 8a Stuff oneself (5)
  4. 9a Engage in a contest (7)
  5. 10a Gun (7)
  6. 11a Strike violently and repeatedly (5)
  7. 12a Accelerate progress (4-5)
  8. 17a When most people sleep (5)
  9. 19a Small falcon (7)
  10. 21a Baseball player (7)
  11. 22a German air raids on London and other UK cities, 1940-41 (5)
  12. 23a ___ , fade, dissolve (video editing technique) (6)
  13. 24a Under (6)
  14. 1d Month with a UK bank holiday (6)
  15. 2d Negative stimulation (4-3)
  16. 3d Observable (5)
  17. 5d African country, independent since 1990 (7)
  18. 6d Tilts over to one side (5)
  19. 7d Sausage — we're in (anag) (6)
  20. 9d Janitor (9)
  21. 13d School bag (7)
  22. 14d Language spoken in Turkey, Iraq, Iran, Syria and Russia by the world's largest ethnic group without its own country (7)
  23. 15d Hidden 10 (6)
  24. 16d Lightweight single-breasted jacket (6)
  25. 18d Elaborate or unusual dress (3-2)
  26. 20d Marten's dark brown fur (5)