Crossword Genius

Vessel not exactly broad in the beam? (6,4)

Ross

I believe the answer is:

narrow boat

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

I don't understand the remainder of the clue.

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(Other definitions for narrow boat that I've seen before include "Canal craft" , "Canal barge" , "Vessel designed for canals" , "Traditional canal transport" , "specialised vessel" .)

I've seen this clue in The Times.
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