Complete
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1 9 12 13 17 20 22 11 2 18 3 23 4 10 16 14 8 21 5 6 15 7 19
  1. 1a Communication mailed with no envelope (8)
  2. 5a A or the? (4)
  3. 9a Rule (5)
  4. 10a Approval (2-5)
  5. 11a Stick tipped with iron (12)
  6. 13a Very much (4,2)
  7. 14a Winter hanger-on? (6)
  8. 17a Amoral (12)
  9. 20a Simulate (7)
  10. 21a Out and away (2,3)
  11. 22a Roué (4)
  12. 23a Supplement at the end of a written work (8)
  13. 1d Fringe benefit (abbr) (4)
  14. 2d Taking possession by force (7)
  15. 3d Two middle pages of a magazine (6,6)
  16. 4d Well-built and rough-looking (6)
  17. 6d Eighth letter in the Greek alphabet (5)
  18. 7d Adapted (8)
  19. 8d Controversial issue that's the talk of the town (5,7)
  20. 12d Odd (8)
  21. 15d Well pleased (informal) (7)
  22. 16d Financial support (6)
  23. 18d Simper (5)
  24. 19d Large African antelope with long straight horns (4)