A member of student body raised division among Muslims (5)
I believe the answer is:
sunni
'division among muslims' is the definition.
I can't judge whether this definition defines the answer.
'a member of student body raised' is the wordplay.
'a member of' becomes 'in' (I can't explain this - if you can you should believe this answer much more).
'student body' becomes 'NUS' (National Union of Students).
'raised' says the letters should be written backwards (going up in a down clue).
'in'+'nus'='innus'
'innus' reversed gives 'SUNNI'.
Can you help me to learn more?
(Other definitions for sunni that I've seen before include "A main branch of Islam" , "Moslem" , "Form of religion" , "One branch of Islam" , "Indian fig tree with aerial roots" .)