Some slaves selling boat (6)

I believe the answer is:

vessel

'boat' is the definition.
(boat is a type of vessel)

'some slaves selling' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'VESSEL' can be found hidden inside 'slaves selling'.

(Other definitions for vessel that I've seen before include "Bark, possibly, needing water" , "Watercraft or water container" , "Large boat; container" , "Blood-carrying tube or a ship" , "Ship, or receptacle for liquid" .)

I've seen this clue in The Daily Express.

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