Complete
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1 8 11 14 18 20 22 2 19 17 10 3 9 4 16 15 5 21 23 6 12 7 13
  1. 1a Plunge (4)
  2. 3a With official authorisation (8)
  3. 8a Siberian city (4)
  4. 9a Supporter of a cause (8)
  5. 11a Improvised musical performance (3,7)
  6. 14a Very small freshwater fish (6)
  7. 15a Jolly good show! (6)
  8. 17a Red booths — 10 (anag) (5,5)
  9. 20a Path of a projectile subject to gravity (8)
  10. 21a Daze (4)
  11. 22a Work and vocation of the priesthood (8)
  12. 23a Mist coming in off the sea (4)
  13. 1d Upright post as part of a frame — do arm job (anag) (8)
  14. 2d Robe worn by choristers during services (8)
  15. 4d Forward surge (6)
  16. 5d Gibberish (5-5)
  17. 6d Skating jump (4)
  18. 7d Fine cord of twisted fibres (4)
  19. 10d Those who hate foreigners (10)
  20. 12d One in favour of the UK trying to go it alone (8)
  21. 13d Golden-brown horse (8)
  22. 16d Rod and line user (6)
  23. 18d Tinned meat (4)
  24. 19d Tiny songbird with a large high-pitched range (4)