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 Spark (9)
  2. 8a ET? (5)
  3. 9a Influential (7)
  4. 10a Midden — nigh dull (anag) (8)
  5. 11a Southend (Essex) has the world's longest one built for pleasure (4)
  6. 13a Purify (6)
  7. 14a Old Portuguese money (6)
  8. 16a What one hits at bedtime? (4)
  9. 17a Minor fight (8)
  10. 19a Dreamy (7)
  11. 20a Encore! (5)
  12. 21a Information on what to wear (or not) (5,4)
  13. 1d Warming rays (8)
  14. 2d Lesion (anag) — it's found underfoot (6)
  15. 3d Domesticate (4)
  16. 4d Running lengthwise, rather than across (12)
  17. 5d With no compromise on offer (3-2-7)
  18. 6d Dish of apples, walnuts, celery and mayonnaise (7,5)
  19. 7d Importance (12)
  20. 12d Identifier used as login (8)
  21. 15d Tracked snow vehicle (6)
  22. 18d Corporations (abbr) (4)