Answer:

soot

Answer	Crossword Clue
SOOT	Chimney fallout
SOOT	Chimney stuff
SOOT	Sweep's target

SOOT	Flue build-up
SOOT	It's found in a stack
SOOT	Carbon particles
SOOT	Chimney coating
SOOT	Flue problem
SOOT	What a chimney sweep sweeps
SOOT	Lampblack
SOOT	Furnace film

SOOT	Powdery pollutant
SOOT	Chimney schmutz
SOOT	Grime
SOOT	Chimney sweep's sweepings
SOOT	North Pole laundry problem
SOOT	Film in a flue
SOOT	Santa-suit stain
SOOT	Flue powder

SOOT	Flue complaint
SOOT	Flue residue
SOOT	Santa sullier
SOOT	Santa's laundry problem
SOOT	Dark powder
SOOT	Chimney sweepings
SOOT	Lampblack source
SOOT	Messy buildup

SOOT	Chimney buildup
SOOT	Chimney residue
SOOT	Concern for Santa
SOOT	Black buildup
SOOT	Chimney sweep's target
SOOT	Spot for Santa
SOOT	Chimney collection
SOOT	Santa soiler

SOOT	Santa's coat?
SOOT	Spot for Santa?
SOOT	Component of Japanese sumi ink
SOOT	Flue coat
SOOT	Sweep's target, perhaps