Complete
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8 10 13 16 6 5 19 1 17 2 9 14 3 11 15 4 12 18 7
  1. 5a Decorate – exaggerate (9)
  2. 8a German form of address (4)
  3. 9a <i>The Big Sleep</i><span> author</span> (8)
  4. 10a Wading birds (6)
  5. 11a Royal Galas, e.g. (6)
  6. 13a Pertaining to a major religion (6)
  7. 15a Outlaw (6)
  8. 16a More complex (8)
  9. 18a <span>Hirsute figure in </span><i>Genesis</i> (4)
  10. 19a Defining or limiting factor – a mere part (anag.) (9)
  11. 1d Divine food (8)
  12. 2d Elastic straps to hold clothing up (6)
  13. 3d Noisy insect (6)
  14. 4d Action (4)
  15. 6d City hosting the Australian Open (9)
  16. 7d Dissenting from the orthodox view (9)
  17. 12d Glasses without arms (5-3)
  18. 14d Decisive moment (6)
  19. 15d Argument (6)
  20. 17d Unfreeze (4)