Complete
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1 8 10 15 17 21 23 2 12 18 3 13 9 19 4 24 5 11 20 22 6 14 7 16
  1. 1a Bogota (anag) (6)
  2. 4a As are all the members of ABBA (6)
  3. 8a Arboreal African snake with a fatal bite (5)
  4. 9a Nervous (7)
  5. 10a School clothing? (7)
  6. 11a Beneath (5)
  7. 12a Great pre-19th century European painter (3,6)
  8. 17a Message received and understood! (5)
  9. 19a Israeli communal settlement (7)
  10. 21a Mythical sea creature (7)
  11. 22a Strip of pleated material used as a trim (5)
  12. 23a Forty winks (6)
  13. 24a Part of a poem (6)
  14. 1d Abnormal tissue growth (6)
  15. 2d Italian toddler (7)
  16. 3d Seabird and bat excrement once widely used as a fertiliser (5)
  17. 5d Diver's outfit (3,4)
  18. 6d Causing terror (5)
  19. 7d English detective-story writer, d. 1957 (6)
  20. 9d Crammed (3-6)
  21. 13d Currently inactive (7)
  22. 14d French Indian Ocean department (7)
  23. 15d Crikey! (6)
  24. 16d Type of rhododendron grown for its showy flowers of different colours (6)
  25. 18d Ravine (5)
  26. 20d Suit (5)