Jail on a ship (4)

I believe the answer is:

brig

(Other definitions for brig that I've seen before include "Two-masted square-rigged sailing ship" , "Sailing-vessel" , "Two-masted square-rigged vessel" , "'Two-masted,square-rigged ship (4)'" , "Two-masted ship; gaol" .)

I've seen this clue in the King Feature Syndicate.

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