Potpie veggie (3)
I believe the answer is:
pea
'potpie veggie' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for pea that I've seen before include "Leguminous seed" , "Spherical vegetable" , "garden plant" , "The plant is a strange ape" , "registered by princess in bed" .)