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 Shower with love (4)
  2. 3a Devilish (8)
  3. 8a Art institution with galleries in London, Liverpool and St Ives in Cornwall (4)
  4. 9a Grow rapidly (overnight?) (8)
  5. 11a Flourishing (10)
  6. 14a Not flourishing (6)
  7. 15a Tiny particle light or electromagnetic radiation (6)
  8. 17a Top grade chef (6,4)
  9. 20a Bonding — hid aeons (anag) (8)
  10. 21a Long story (with a twist?) (4)
  11. 22a Fishlike jawless vertebrates (of which Henry I is said to have eaten a surfeit and died) (8)
  12. 23a __ von Bismarck, first chancellor of Germany (4)
  13. 1d Organised body of related information (8)
  14. 2d Intensive teaching session given to one or a small number of students (8)
  15. 4d Large tropical American spiny-backed lizard (6)
  16. 5d Late (10)
  17. 6d Plunder (4)
  18. 7d Turn up (4)
  19. 10d Google Chrome, for example (3,7)
  20. 12d Loyal supporter (8)
  21. 13d Indirect malicious implication (8)
  22. 16d Stupid behaviour (6)
  23. 18d Become less interesting (4)
  24. 19d Mate (informal) (4)