Time Waits for No-one

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Across
  1. 3. Adorns many a weathervane (3,6,4)
  2. 6. It may help avoid problems later (1,6,2,4)
  3. 7. He may see you in a while (9)
  4. 9. WH Auden's Funeral Blues (4,3,3,6)
  5. 13. Figure of fun in early Spring (5,4)
  6. 14. A very rare celestial event (4,2,1,4,4)
  7. 16. Garb for wedding or races! (7,4)
  8. 19. Helpful assistant on a desert island (3,6)
  9. 20. When I'll see thee more clearly (3,2,3)
  10. 21. When the sun will come out (8)
Down
  1. 1. It'll never happen in this month! (5,2,7)
  2. 2. Valli or Vivaldi? (4,7)
  3. 4. Mid morning break (9)
  4. 5. Time for supernatural nasties (8,4)
  5. 8. Help for a ship's floor? (6)
  6. 10. Not new on your watch! (6,4)
  7. 11. May be required if there's no winner (5,4)
  8. 12. Hang on for this popular Radio 4 quiz (4,1,6)
  9. 14. Chance to earn extra cash (8)
  10. 15. He may see you later (10)
  11. 17. Earns pavilion applause or royal acknowledgement (7)
  12. 18. When you won't get jam (5)