Corn I found in labyrinth (5)
I believe the answer is:
maize
'corn' is the definition.
(I know that corn can be written as maize)
'i found in labyrinth' is the wordplay.
'found in' means one lot of letters goes inside another.
'labyrinth' becomes 'maze' (synonyms).
'i' inserted within 'maze' is 'MAIZE'.
(Other definitions for maize that I've seen before include "Oil producer" , "one could make a meal of it" , "Corncob plant" , "Source of sweetcorn" , "Plant producing sweetcorn" .)