Army rank above colonel (abbr) (4)

I believe the answer is:

brig

(Other definitions for brig that I've seen before include "Two-masted square-rigger" , "Two-masted square rigger" , "staff officer briefly used" , "Two-masted square-rigged sailing ship" , "Sailing vessel or lock-up on board" .)

I've seen this clue in The Guardian.

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