Prison on a US navy ship (4)

I believe the answer is:

brig

(Other definitions for brig that I've seen before include "Two-masted square-rigged sailing ship" , "Ship; a ship's jail" , "Two-masted ship; gaol" , "Ship; ship's prison" , "Two-masted square-rigged vessel" .)

I've seen this clue in The Mirror.

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