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 Talk informally (7)
  2. 8a So 'noire' (anag) (7)
  3. 9a Armed thief (7)
  4. 10a St Andrew's cross (7)
  5. 11a Teams in racing boats (5)
  6. 13a Suite of rooms (9)
  7. 15a Trivia (informal) (5,4)
  8. 18a Transform (5)
  9. 21a Remove completely (4,3)
  10. 22a Large public transport vehicle (7)
  11. 23a Bristle (7)
  12. 24a Frog's larval stage (7)
  13. 1d Having the shape of Rubik's puzzle (5)
  14. 2d Come up (5)
  15. 3d Porky Pig's sign-off line (5,3,5)
  16. 4d Long arm of the Indian Ocean between Africa and Arabia (3,3)
  17. 5d Taught to use a pot (6-7)
  18. 6d Search for water underground, as with a rod (6)
  19. 7d Reverse (6)
  20. 12d Space (with a view?) (4)
  21. 14d Central area of a church (4)
  22. 15d Crazy (informal) (6)
  23. 16d Greek god — said no (anag) (6)
  24. 17d Obtain by coercion (6)
  25. 19d Banned (5)
  26. 20d ___ the Riveter, cultural icon in the US during World War II, (5)