Crossword Genius

Vegetable extract on hand (9)

Ross

I believe the answer is:

mangetout

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'vegetable' is the definition.
(I've seen this before)

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

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(Other definitions for mangetout that I've seen before include "Type of pea" , "vegetables" , "something on the plate" , "Sugar peas" , "From this pod" .)

I've seen this clue in The Telegraph.
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