In school group it makes bread (5)
I believe the answer is:
pitta
'bread' is the definition.
(pitta is a type of bread)
'in school group it' is the wordplay.
'in' indicates putting letters inside.
'school group' becomes 'pta' (I've seen this in another clue).
'pta' going around 'it' is 'PITTA'.
'makes' acts as a link.
(Other definitions for pitta that I've seen before include "Slightly leavened bread" , "Type of flatbread" , "Flat bread that's split to take a filling" , "I might have a kebab in" , "Middle Eastern bread" .)