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 High-quality wooden furniture (11)
  2. 7a Groucho or Karl? (4)
  3. 8a In the manner of a ruffian (8)
  4. 9a Chap with a carrot for a nose? (7)
  5. 11a Kind of dirty music? (5)
  6. 13a Weave into braids (5)
  7. 14a Well (7)
  8. 16a State in control over a subservient one — Iran/Suez (anag) (8)
  9. 17a Inverted stitch (4)
  10. 18a Squander (7,4)
  11. 1d Mountain goat (4)
  12. 2d Detains (anag) — in lieu (7)
  13. 3d Fat — dark beer (5)
  14. 4d Silly comic verse (8)
  15. 5d Scan TV stations (7,4)
  16. 6d One version of Nelson's dying words (4,2,5)
  17. 10d Supposedly harmless fib (5,3)
  18. 12d Name for Mr Fox (7)
  19. 15d Matilda's dance (to Strauss's music?) (5)
  20. 17d Weakest chess piece (4)