Crossword Genius

Byproduct of burning tobacco (3)

Ross

I believe the answer is:

tar

(Other definitions for tar that I've seen before include "Road surfacing or old sailor" , "Thick, black and sticky liquid" , "Pitch; sailor" , "Informal sailor or road-surfacing material" , "Dark viscous flammable substance" .)

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