Crossword Genius

US naval prison (4)

Ross

I believe the answer is:

brig

(Other definitions for brig that I've seen before include "senior officer briefly used" , "Two-masted square rigger" , "Two-masted square-rigger" , "Two-masted square-rigged vessel" , "Two-masted square-rigged sailing ship" .)

I've seen this clue in The Times.
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