In a labyrinth I found corn (5)
I believe the answer is:
maize
'corn' is the definition.
(I know that corn can be written as maize)
'in a labyrinth i' is the wordplay.
'in' means one lot of letters goes inside another.
'a labyrinth' becomes 'maze' (synonyms).
'maze' placed around 'i' is 'MAIZE'.
'found' is the link.
(Other definitions for maize that I've seen before include "Cereal grass producing corncobs" , "Corncob plant" , "Oil producer" , "source of food" , "Indian corn" .)