Vegetable vessels (6)

I believe the answer is:

gourds

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'vessels' is the definition.
(gourd is a kind of vessel)

I don't understand the remainder of the clue.

(Other definitions for gourds that I've seen before include "Large hard-skinned fruits" , "So drug is found in these fruit-bowls" , "they're fruity!" , "Bottles made from fruit rinds" , "Hard, woody shells" .)

I've seen this clue in the Evening Standard.

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