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 US civil rights activist, assassinated 1968 (4)
  2. 3a Last hurrah (4,4)
  3. 9a Swimming costume — in a mink (anag) (7)
  4. 10a Birds in a gaggle (5)
  5. 11a Small canoe (5)
  6. 12a Restaurant or cafe (informal) (6)
  7. 14a Uncompromising enforcement of a rule (4,9)
  8. 17a Unfortunate accident (6)
  9. 19a Rinse with a liquid (5)
  10. 22a Razzle-dazzle (5)
  11. 23a Plug that can connect two or more pieces of equipment to the same electric supply (7)
  12. 24a Govern (8)
  13. 25a Make happen at the same time (abbr) (4)
  14. 1d Reckless and self-destructive (8)
  15. 2d Nitwit (informal) (5)
  16. 4d Possession whose upkeep is excessively expensive (5,8)
  17. 5d '__ and Day' (1932 Cole Porter song) (5)
  18. 6d Invade in great numbers (7)
  19. 7d Someone or something that's a success (4)
  20. 8d Protestors posted outside a building during a strike to encourage others not to go in to work (6)
  21. 13d Spectacularly quick (8)
  22. 15d Barrier — complaining (7)
  23. 16d Officially annul (6)
  24. 18d Tree — nut — Watership Down character (5)
  25. 20d Mole's friend in The Wind in the Willows (5)
  26. 21d Food thickener extracted from algae (4)