Complete
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7 14 19 1 9 12 21 2 15 3 11 20 10 4 18 16 5 8 13 6 17
  1. 1a Something that's common knowledge but should be confidential? (4,6)
  2. 7a Grumble (8)
  3. 8a Once ___ a Time in America, 1984 film directed by Sergio Leone (4)
  4. 9a Change (4)
  5. 10a Challenge (7)
  6. 12a Irascible – MP berated Ed (anag) (3-8)
  7. 14a Dreadful (7)
  8. 16a Scaredy-cat (4)
  9. 19a Temporary anomaly (4)
  10. 20a Hostile (8)
  11. 21a Disrespectful (10)
  12. 1d Switch positions? (2-3)
  13. 2d Set out in detail (7)
  14. 3d Have a long bath (4)
  15. 4d Monument honouring the fallen (8)
  16. 5d Discharge steadily (5)
  17. 6d Unnatural, artificial (6)
  18. 11d PS Elaine (anag) – fine (8)
  19. 12d Cocooning environment (6)
  20. 13d Standard – procedure (7)
  21. 15d Very – great (5)
  22. 17d Way into mine (5)
  23. 18d Widespread (4)