Crossword Genius

Sailor (4)

Ross

'sailor' is the definition.
(jack can informally mean a sailor)

This is all the clue.

(Other definitions for jack that I've seen before include "Dog akin to 9" , "Face card" , "car tool" , "Male donkey" , "Playing card; sailor" .)

I've seen this clue in the Penny Press, the King Feature Syndicate, the Evening Standard and The Telegraph.
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