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 Shrub with berries used to flavour gin (7)
  2. 8a In a shrewd way (7)
  3. 9a Unit of explosive power (7)
  4. 10a Tooth doctor (7)
  5. 11a Rapid simultaneous shooting (5)
  6. 13a Luxurious car (with a chauffeur?) (9)
  7. 15a Go to sleep! (6,3)
  8. 18a Violent disturbance (5)
  9. 21a Behaved dishonestly (7)
  10. 22a Nero or I (anag) — from which a common metal comes (4,3)
  11. 23a It's offensively ugly (7)
  12. 24a Hovering singer (7)
  13. 1d The first king of England and Scotland (5)
  14. 2d First name of the leader of the Brexit Party since 2019 (5)
  15. 3d Place to fill the tank (6,7)
  16. 4d Unsystematic (6)
  17. 5d Hum yon quartet (anag) — basic explanation of all modern physics (7,6)
  18. 6d Sign of the zodiac (6)
  19. 7d Evergreen shrub with white flowers (6)
  20. 12d German-based supermarket chain (4)
  21. 14d Hopeless (informal) (2,2)
  22. 15d Growth found on tree trunks and rocks (6)
  23. 16d Bloke (6)
  24. 17d Once popular songs (often golden) (6)
  25. 19d Bowed instrument slightly larger than a violin (5)
  26. 20d Examine (5)