Military vessel (7)

I think it could be either:

warship

gunboat

'military vessel' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for gunboat that I've seen before include "Not a bug (anag)" , "Military vessel" , "Coastal warship" , "Small military ship" , "Naval symbol of aggression" .)

I've seen this clue in the Penny Press, The Guardian and The Mirror.

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