School is beginning to mend division of opinion (6)
I believe the answer is:
schism
'division of opinion' is the definition.
'schism' can be an answer for 'division' (schism is a kind of division). I'm unsure of the 'of opinion' bit.
'school is beginning to mend' is the wordplay.
'school' becomes 'sch' (abbreviation).
'beginning to' indicates taking the first letters.
The first letter of 'mend' is 'm'.
'sch'+'is'+'m'='SCHISM'
Can you help me to learn more?
(Other definitions for schism that I've seen before include "Formal split in a religion" , "Split in church unity" , "Serious split in a group" , "Split, especially ecclesiastical" , "Deep division" .)