Primate cycling to deliver vegetable ... (3)
I believe the answer is:
pea
'vegetable' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
(Other definitions for pea that I've seen before include "Leguminous plant" , "The plant is a strange ape" , "Edible green seed" , "Leguminous vegetable" , "Ape this plant awkwardly" .)