Happy Birthday Too

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Across
  1. 5. mix of decaying substances used as fertilizer (7)
  2. 8. creation of folded, stiff paper greeting device (10)
  3. 9. anniversary of nascence (8)
  4. 10. denim trouser (4)
  5. 12. score and three threes (5,4)
Down
  1. 1. edible to coeliacs (6,4)
  2. 2. mammal that eats grass and flowers in garden (6)
  3. 3. joyous (5)
  4. 4. in addition; very (3)
  5. 5. place with previously stuck lock (12)
  6. 6. 7pm phone caller (6 or 3,3)
  7. 7. cultivating and tending to plants (9)
  8. 9. dark coloured avian which eats raisins (9)
  9. 10. jersey detective (4,7)
  10. 11. cutable sign of ageing (4,4)