Complete
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7 14 19 1 9 12 21 2 15 3 11 20 10 4 18 16 5 8 13 6 17
  1. 1a Bath time floater? (6,4)
  2. 7a Loud and mournful (8)
  3. 8a Affliction (4)
  4. 9a Noel (4)
  5. 10a Debris on the water (7)
  6. 12a Flowing movement made by sporting crowds (7,4)
  7. 14a Letters taken out of order to discover a hidden meaning (7)
  8. 16a Thailand once (4)
  9. 19a Malaysian dagger (4)
  10. 20a Blowing in bursts (8)
  11. 21a Brief strong spike in demand for electricity (5,5)
  12. 1d Improve (5)
  13. 2d 1970 union of three European countries that abolished all internal border controls (7)
  14. 3d The first garden? (4)
  15. 4d Statement above a news item giving its time and place of origin (8)
  16. 5d Italian explorers, John and Sebastian, who led English and Spanish expeditions to explore the New World (5)
  17. 6d Enter by force (6)
  18. 11d Make unintelligible (8)
  19. 12d Chanted phrase (6)
  20. 13d Pilot (7)
  21. 15d Relish (5)
  22. 17d Butter substitute (abbr) (5)
  23. 18d Kerfuffle (4)