Crossword Genius

Road gunk . . . or, when doubled, tooth gunk (3)

Ross

I believe the answer is:

tar

(Other definitions for tar that I've seen before include "Thick, black and sticky liquid" , "It paves the way" , "It may cover the road" , "Crewman" , "Sailor (colloq.)" .)

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