Crossword Genius

Roof-patching goo (3)

Ross

I believe the answer is:

tar

(Other definitions for tar that I've seen before include "used by those who pay to work on deck" , "'Thick, dark, sticky liquid (3)'" , "Jack ..., British sailor" , "Black viscid substance" , "Informal name for sailor" .)

I've seen this clue in the Newsday.
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