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 Like a diamond (or champagne?) (9)
  2. 8a Under (5)
  3. 9a 1916 North Sea naval battle (7)
  4. 10a Advance beyond the usual limit (8)
  5. 11a Swelter — fret (4)
  6. 13a Swiss cottage? (6)
  7. 14a Lion or tiger? (3,3)
  8. 16a Egg-shaped (4)
  9. 17a Dark shade (for sailors?) (4,4)
  10. 19a From Port-au-Prince? (7)
  11. 20a Ancient port of Rome (5)
  12. 21a Awareness — nice teens (anag) (9)
  13. 1d Large sailing ship with two or more masts (8)
  14. 2d Wretched (6)
  15. 3d Flesh and blood (4)
  16. 4d Unable to express oneself (12)
  17. 5d Fail (2,4,3,3)
  18. 6d Pants, vest etc (12)
  19. 7d Drunken (12)
  20. 12d Place for one to find peace and quiet? (4-4)
  21. 15d Collide at an angle (6)
  22. 18d Little (in size) (4)