Possible Clues:

• He brings gifts round that woman's -- its charm's in refinement
• In truth, a parent fine with head of tribe in matriarch: she's remarkable
• Priest on holiday who's sacked for toying with children
• Britain’s equivalent of Santa, and a hint to the circled letters
• Annual visitor in cavalier charms at first: that man welcomed in
• March first, he sat tight: late December he's busy
• Provider of child benefits in disorganised firm hates charts
• British bringer of gifts
• March first: he sat tight; then December, did he get moving?
• What 20 Across is called in England