Crossword Genius

Undersea vessel (3)

Ross

I believe the answer is:

sub

'undersea vessel' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for sub that I've seen before include "Loan" , "Replacement" , "Briefly, membership fee or stand-in" , "Underwater boat" , "Navy vessel" .)

I've seen this clue in the Newsday.com, The Telegraph and The Sun.
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