Crossword Genius

Chimney buildup (4)

Ross

I believe the answer is:

'chimney buildup' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for soot that I've seen before include "Stuff from chimneys" , "Deposited carbon" , "Chimney deposit" , "Something stuck down the chimney" , "Fine carbon deposit" .)

I've seen this clue in the Universal, The New York Times and the King Feature Syndicate.
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