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 Behaving very amorously (5-2)
  2. 8a City on the Rhine, home to the largest university in the Netherlands (7)
  3. 9a ___ Mustard, army officer in Cluedo (7)
  4. 10a Perforated (7)
  5. 11a Bossy or impertinent little girl (5)
  6. 13a Group around a person of importance (9)
  7. 15a Self-service eatery (9)
  8. 18a Go over again (abbr) (5)
  9. 21a With everything in (3,4)
  10. 22a Quiver (7)
  11. 23a Stipulation (7)
  12. 24a When sex starts to kick in? (7)
  13. 1d Temporary substitute in 4 (5)
  14. 2d Well-founded (5)
  15. 3d My pleasure! (4,7,2)
  16. 4d Guard rail round the bow of a yacht (6)
  17. 5d Drink, hit and sing, for example — rarer liver bug (anag) (9,4)
  18. 6d Shrub or tree with clusters of white or yellow flowers (6)
  19. 7d Heavy filling food (6)
  20. 12d Distinctive atmosphere (4)
  21. 14d Carnival (4)
  22. 15d They hold things together (6)
  23. 16d Bird of prey (John Huston directed one from Malta) (6)
  24. 17d British tabloid (3,3)
  25. 19d Scottish pole (5)
  26. 20d Unthinking belief (5)