Crossword Genius

Speck of soot (4)

Ross

I believe the answer is:

smut

'speck of soot' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for smut that I've seen before include "Cereal disease; filth" , "Dirt or immoral talk" , "Dirty stuff" , "Dirty jokes - black mark" , "Dirt or pornography" .)

I've seen this clue in The Mirror, The Irish Times, The Telegraph and the Evening Standard.
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