17.

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Across
  1. 4. Formality shown by top of the bill before church? (6)
  2. 5. How the cowboy collects the cows till the cows come home (6,2)
  3. 8. Place that will be empty until the cows come home?
  4. 9. Till the cows come home
  5. 11. She won't work till the cows come home
  6. 12. Protest movement raised firm support at start of year (6)
  7. 14. Might one be blown till the cows come home? (9)
  8. 16. Top score before season nearly is over (6)
  9. 19. Go green after trouble at start of year (6)
  10. 20. List of business information a lawyer withholds (6)
  11. 21. Possible score before a rubber game
Down
  1. 1. Till the cows come home here? (4)
  2. 2. Constant mix up of dates at start of year (6)
  3. 3. Till the cows come home
  4. 6. Score before a rubber game, perhaps
  5. 7. Half-presented idea by Olympic officials before start of year shows stupidity (6)
  6. 9. Columnist painting around start of year (6)
  7. 10. Passionately desire to seize day at start of year (6)
  8. 13. Harsh-sounding way to get money at start of year (6)
  9. 15. What to add to number for when pigs fly till the cows come home (4,5)
  10. 17. Unhappiness for skinflint before start of year (6)
  11. 18. Five pound ten bill before the run-up to Christmas (6)