Legume (3)
I believe the answer is:
pea
'legume' is the definition.
(I know that pea is a type of legume)
This is all the clue.
(Other definitions for pea that I've seen before include "Small vegetable" , "Edible seed from pod" , "Annual climbing plant with edible seeds" , "Pulse vegetable" , "It may climb frame" .)