Vessel returning with some halibut (3)

I believe the answer is:

tub

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

I can't explain the rest of the clue.

(Other definitions for tub that I've seen before include "Plastic container" , "Open container, for liquid say" , "old boat?" , "Barrel; boat" , "Bottom half of a barrel" .)

I've seen this clue in the Evening Standard.

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