Vegetable the greengrocer sells dozens of? (8)

I believe the answer is:

eggplant

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'vegetable' is the definition.
(I know that eggplant is a type of vegetable)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for eggplant that I've seen before include "Another word for aubergine" , "What goes into moussaka" , "US name for aubergine" , "It's also called aubergine" , "Its fruit is aubergine" .)

I've seen this clue in the Evening Standard.

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