Complete
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7 9 13 16 5 18 1 10 2 8 15 14 3 12 11 4 17 6
  1. 5a Tactic intended to confuse or obscure (11)
  2. 7a King of Mercia with a dyke to his name (4)
  3. 8a Breakfast food (in prison?) (8)
  4. 9a Rudeness (7)
  5. 11a Parent's siblings (5)
  6. 13a Web-footed bird (5)
  7. 14a Wind storm (7)
  8. 16a Anticipated (8)
  9. 17a Summit (4)
  10. 18a Interruption of a peaceful state (11)
  11. 1d Concluding passage, event or section (4)
  12. 2d Let-up (7)
  13. 3d Match result (5)
  14. 4d What remains after the rest has been removed (8)
  15. 5d Progress has been satisfactory up to now (2,3,2,4)
  16. 6d Songbird (11)
  17. 10d Spread out (8)
  18. 12d Anon (2,3,2)
  19. 15d Roman counterpart of Aphrodite (5)
  20. 17d Small horse (4)