Complete
00:00:00
7 14 19 1 9 12 21 2 15 3 11 20 10 4 18 16 5 8 13 6 17
  1. 1 a Early form of bicycle (10)
  2. 7 a Overcome (8)
  3. 8 a Single thing (or two people?) (4)
  4. 9 a Roman gent's garment (4)
  5. 10 a Penmanship (7)
  6. 12 a Readiness to welcome guests (11)
  7. 14 a Seriousness (7)
  8. 16 a Fourth rock from the sun (4)
  9. 19 a Become obstructed (4)
  10. 20 a Scottish knitwear design (4,4)
  11. 21 a Lack of due care and attention (10)
  12. 1 d Arched ceiling (5)
  13. 2 d West-central French city — kind of porcelain (7)
  14. 3 d Foul substance (informal) (4)
  15. 4 d Fatherly (8)
  16. 5 d Go with the flow (5)
  17. 6 d With enthusiasm (6)
  18. 11 d Jocund (8)
  19. 12 d Rush headlong (6)
  20. 13 d One from Qom? (7)
  21. 15 d Fashion (5)
  22. 17 d Puzzle out (5)
  23. 18 d Billie Jean (née Moffitt, 1943) (4)

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