Chimney dust (4)

I believe the answer is:

soot

'chimney dust' 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 "Deposited carbon" , "Stuff from chimneys" , "Carbon deposit from burning" , "Something stuck down the chimney" , "Chimney coating" .)

I've seen this clue in the LA Times, the Newsday and the Sydney Morning Herald.

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