Slightly leavened bread (5)
I believe the answer is:
pitta
'slightly leavened bread' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for pitta that I've seen before include "Slightly leavened bread" , "Flat bread that's split to take a filling" , "I might have a kebab in" , "Partially-leavened bread of the Near East" , "Flat sort of bread" .)