Appearing to have vegetable (3)
I believe the answer is:
pea
'vegetable' is the definition.
(I've seen this before)
'appearing to have' is the wordplay.
'to have' says the answer is hidden in the clue.
'PEA' can be found hidden inside 'appearing'.
(Other definitions for pea that I've seen before include "Edible green seed" , "Ape this plant awkwardly" , "Legume" , "Tiny stone" , "Edible seed from pod" .)