Crossword Genius

Flue coating (4)

Ross

I believe the answer is:

soot

'flue coating' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for soot that I've seen before include "Deposited carbon" , "Carbon deposit from burning" , "Black chimney powder" , "Chimney coating" , "Residue from burning" .)

I've seen this clue in the Newsday.
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