Collectors, Collections and Collective nouns!

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Across
  1. 3. A debt collector (7)
  2. 6. Collection at church service (9)
  3. 8. A series of untruths (4,2,4)
  4. 10. 1999 Denzil Washington film (3,4,9)
  5. 12. A rarity (11,4)
  6. 14. Stairs take to the air (6)
  7. 16. Messenger of the Gods, collection and delivery (6)
Down
  1. 1. Tuneful angels!(5)
  2. 2. James Joyce short story collection (9)
  3. 3. Apartments in a cube? (5,2,5)
  4. 4. Stamp collector (11)
  5. 5. Lions pleased with themselves (5)
  6. 7. Collection of short works (9)
  7. 9. Educated whales? (6)
  8. 11. Military monkeys (5)
  9. 13. Capital offence for crows (6)
  10. 15. Entertaining angels! (4)