Ape mixed up vegetable (3)

I believe the answer is:

pea

'vegetable' is the definition.
(pea is a type of vegetable)

'ape mixed up' is the wordplay.
'mixed up' is an anagram indicator.
'ape' anagrammed gives 'PEA'.

(Other definitions for pea that I've seen before include "Climbing plant; vegetable" , "Leguminous plant" , "Little green vegetable" , "Small vegetable" , "food item" .)

I've seen this clue in The Mirror.

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