Crossword Genius

Black salt? (3)

Ross

I believe the answer is:

tar

I believe this clue is a double definition.

'black' is the first definition.
(I've seen this in other clues)

'salt?' is the second definition.
(both can informally mean a sailor)

(Other definitions for tar that I've seen before include "'Thick, dark, sticky liquid (3)'" , "Product of coal" , "used by those who pay to work on deck" , "Jack < to blacken" , "Dark viscous stuff" .)

I've seen this clue in the Evening Standard and The Globe and Mail.
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