PRJ Cryptic Crossword v 3 (Xmas Edition)

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Across
  1. 4. Carol is inaudible, Lancelot perhaps lacks potassium (6, 5)
  2. 5. Grayish lift moves towards pretty illumination (5, 5)
  3. 11. A former colleague, Jesus's mother, canonised in Italy. (10)
  4. 12. And on the third day of Christmas: poule, poule, poule (5, 5, 4)
  5. 14. An unusual cot from a manager without one. (6)
  6. 16. My rogue ramblings, henceforth starts with a gift for baby Jesus. (5)
  7. 17. Sinatra perhaps, makes very angry accompaniment to 16 Across (12)
  8. 19. Benchtop celebration for the other side (12)
Down
  1. 1. Finding an ornament in a cryptic crossword? That’s BAU Bleby. (6)
  2. 2. Take a punt on hydrogen, the French skirt edge of birthplace. (9)
  3. 3. Drastic charms disturbed annual post (9, 4)
  4. 6. The festive season results in a troubling Yeti duel. (8)
  5. 7. Decoration found in worst area. (4)
  6. 8. Santa goes East to find contractual provision. (6)
  7. 9. Show the gift now, I say. (7)
  8. 10. Mafia boss is essential beast of burden. (6)
  9. 13. Kick dance with 500 (variable), entertaining start for a sugary treat (5, 4)
  10. 15. Irving Berlin's Christmas dream for Sam. (5)
  11. 18. Christmas helpers endure laborious false-starts (3)