Crossword Genius

Flue symptom? (4)

Ross

I believe the answer is:

soot

'flue symptom?' 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 "Carbon dust from fire" , "Carbon deposit from burning" , "Something stuck down the chimney" , "Deposited carbon" , "Stuff from chimneys" .)

I've seen this clue in The New York Times.
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