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

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