Crossword Genius

Roofing gunk (3)

Ross

I believe the answer is:

tar

'roofing gunk' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for tar that I've seen before include "Road-dressing for a sailor?" , "Informal sailor or road-surfacing material" , "one may need to pay on boat" , "Kind of rat for sailor" , "Old salt or liquid from coal" .)

I've seen this clue in the Universal.
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