Vegetable to drain needing stock (7)

I believe the answer is:

pumpkin

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'vegetable' is the definition.
(pumpkin is a kind of vegetable)

I don't understand how the rest of the clue works.

(Other definitions for pumpkin that I've seen before include "Large round fruit - coach for Cinderella?" , "Large orange fruit of the squash family" , "Type of squash" , "Halloween vegetable" , "Orange-yellow fruit" .)

I've seen this clue in The Sun.

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