Crossword Genius

Roofing liquid (3)

Ross

I believe the answer is:

tar

(Other definitions for tar that I've seen before include "Black substance in cigarettes" , "Cigarette residue - old word for sailor" , "Black liquid from coal" , "It may cover the road" , "Sticky road material or informal sailor" .)

I've seen this clue in the Penny Press.
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