Crossword Genius

Deposited carbon (4)

Ross

I believe the answer is:

soot

'deposited carbon' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for soot that I've seen before include "Chimney deposit" , "Carbon black" , "Fine carbon deposit" , "Deposited carbon" , "Carbon deposit from burning" .)

I've seen this clue in The Times.
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