Complete
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6 8 10 13 16 19 21 7 1 18 17 2 9 15 14 3 12 20 11 4 5
  1. 1a To blather (anag) — promise to marry (9)
  2. 8a Secret store of valuables (5)
  3. 9a Before all else (7)
  4. 10a Acknowledge applause (4,1,3)
  5. 11a Small Old World songbird of the thrush family (4)
  6. 13a Unit of angular distance (6)
  7. 14a Long tapering flag (6)
  8. 16a High time? (4)
  9. 17a Utter effrontery (8)
  10. 19a Covetousness (7)
  11. 20a Pleasurable sounds (5)
  12. 21a Completely accurate (9)
  13. 1d Dishonesty in a transaction (3,5)
  14. 2d Coating for non-stick utensils (6)
  15. 3d Giant given to eating humans (4)
  16. 4d Pole for tethering a horse (8,4)
  17. 5d Over-egg the pudding? (3,2,2,5)
  18. 6d Composite visual image (12)
  19. 7d In seventh heaven (7,2,3)
  20. 12d Denominations of small Swiss coins (8)
  21. 15d Take illegally (6)
  22. 18d Fashion designer, Christian, d. 1957 (4)