Crossword Genius

Chimney substance (4)

Ross

I believe the answer is:

soot

'chimney substance' 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" , "Black chimney powder" , "Carbon black" , "Chimney deposit" , "Deposited carbon" .)

I've seen this clue in the Penny Press, the USA Today, the Universal and the L.A. Times Daily.
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