Complete
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7 14 19 1 9 12 21 2 15 3 11 20 10 4 18 16 5 8 13 6 17
  1. 1a Implausible (3-7)
  2. 7a Lacking the sense one was born with (8)
  3. 8a Au courant (2,2)
  4. 9a Snare (4)
  5. 10a Obscure completely (4,3)
  6. 12a Metaphor for British national newspapers (5,6)
  7. 14a Cut of beef (7)
  8. 16a Regretted (4)
  9. 19a Part of speech (4)
  10. 20a Tester (8)
  11. 21a Despite the prevailing circumstances (10)
  12. 1d Meteorological boundary between different air masses (5)
  13. 2d Run wild (7)
  14. 3d Stared at (4)
  15. 4d Choose by random selection (4,4)
  16. 5d Break out (5)
  17. 6d Dairy product made from curdled milk (6)
  18. 11d And the rest (Latin) (2,6)
  19. 12d Not spontaneous (6)
  20. 13d Hard to catch (7)
  21. 15d Cavalry sword (5)
  22. 17d Attire (5)
  23. 18d Without the natural covering (4)