Complete
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8 9 11 14 18 22 24 1 2 19 3 13 12 4 10 17 15 5 21 23 20 6 16 7
  1. 1a I don't know! (3,2,7)
  2. 9a Demand and obtain (5)
  3. 10a Dozens (7)
  4. 11a Indicates agreement (4)
  5. 12a I am to blame! (Latin) (3,5)
  6. 14a Kind of terrier (informal) (6)
  7. 15a Caught sight of (6)
  8. 18a Holiday (8)
  9. 20a Small Scottish island (4)
  10. 22a Lamb and vegetable casserole — nirvana (anag) (7)
  11. 23a Bird — boy's name (5)
  12. 24a Gunners (12)
  13. 2d Defame (7)
  14. 3d Silent (4)
  15. 4d Prime Minister 1945-51 (6)
  16. 5d Sunless (8)
  17. 6d Squalid dwelling (5)
  18. 7d Get up! (4,3,5)
  19. 8d The Keystone State (12)
  20. 13d Relating to a shore (8)
  21. 16d Dishonourable (7)
  22. 17d Swoop (as in an attack) (6)
  23. 19d Long to have (5)
  24. 21d Licentious revel (4)