When Santa Got Stuck Up the __; Fireplace Vent
Puzzle 7 of Christmas Carols Piece of Cake Pack
Question is: When Santa Got Stuck Up the __; Fireplace Vent
and the answer is: CHIMNEY
Word Meaning:
CHIMNEY — A vertical tube or hollow column used to emit environmentally polluting gaseous and solid matter (including but not limited to by-products of burning carbon- or hydrocarbon-based fuels); a flue.
Definitions from Wiktionary.