Vessel, cooking vessel (7)

I believe the answer is:

steamer

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'cooking vessel' is the definition.
(device for steaming food)

I can't explain the rest of the clue.

(Other definitions for steamer that I've seen before include "like the African Queen!" , "Old-style ship" , "Kitchen pan; ship" , "Boat; type of saucepan" , "Cooking apparatus" .)

I've seen this clue in The Telegraph.

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