Complete
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7 9 16 17 20 22 1 12 13 2 18 3 10 23 8 11 21 4 14 19 5 15 6
  1. 1 a Add on at the end (6)
  2. 4 a Go faster, horsey! (3,2)
  3. 7 a Give birth to piglets (6)
  4. 8 a Stylish (6)
  5. 9 a Disgusting waste matter (4)
  6. 10 a Firmly tethered (8)
  7. 12 a What holds the main microchips in a computer (11)
  8. 17 a Superior skill (8)
  9. 19 a Heavy dull sound (4)
  10. 20 a Petrol jelly used in flame-throwers (6)
  11. 21 a Supernatural (6)
  12. 22 a Sexually attractive? (5)
  13. 23 a Vanquish (6)
  14. 1 d A ragman (anag) (7)
  15. 2 d Gemstone — pre-do it (anag) (7)
  16. 3 d Guardian seller? (9)
  17. 4 d Diagram showing the relationship between variable quantities (5)
  18. 5 d Sovereign (7)
  19. 6 d Ceremonial procession (6)
  20. 11 d Place for keeping bits and bobs (9)
  21. 13 d Sea creature's tentacles served as food (7)
  22. 14 d 'The', definitely (7)
  23. 15 d Pair of similar things (7)
  24. 16 d Hard dark-brown wood used furniture (6)
  25. 18 d With a smooth, gleaming surface (5)

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