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 Properties of a space that determine how sound is transmitted (9)
  2. 8a Pull up (5)
  3. 9a Hot wind blowing from North Africa to southern Europe (7)
  4. 10a Like Janus? (3-5)
  5. 11a Having knowledge of (2,2)
  6. 13a Lamb or veal chop from behind the neck (6)
  7. 14a Work (6)
  8. 16a German car manufacturer, founded 1862 (4)
  9. 17a German motorway (8)
  10. 19a Slippery surface for recreation (3,4)
  11. 20a Fine net used in veils (5)
  12. 21a Make someone understand (3,6)
  13. 1d Animal with long tongue that collects insects (8)
  14. 2d Thrown out (6)
  15. 3d Agricultural worker bound by the feudal system (4)
  16. 4d Miserable and beyond cheering up (12)
  17. 5d Fashionable upper-class young woman (6,6)
  18. 6d Anything happening? — hawking coots (anag) (5,7)
  19. 7d Old time corporal punishment (3,2,3,4)
  20. 12d Old time French dances (8)
  21. 15d Bird — bananas (6)
  22. 18d Thin plate (4)