Vessel, cutter perhaps, leaving Dartmouth at last (4)

I believe the answer is:

ewer

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'vessel' is the definition.
(ewer is a kind of vessel)

I can't explain the remainder of the clue.

(Other definitions for ewer that I've seen before include "from which liquid may be poured" , "Large pitcher" , "29 [VESSEL]" , "Large, wide-mouthed jug" , "Sort of jug" .)

I've seen this clue in The Times.

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