Overpower extremists following religious group, creating division (6)
I believe the answer is:
sector
'division' is the definition.
(I've seen this before)
'overpower extremists following religious group' is the wordplay.
'extremists' means to remove the middle letters (letters on the extreme ends of the word).
'following' is a charade indicator (letters next to each other).
'religious group' becomes 'sect' (eg a religious sect).
'overpower' with its centre taken out is 'or'.
'or' put after 'sect' is 'SECTOR'.
'creating' is the link.
(Other definitions for sector that I've seen before include "A branch of enterprise" , "Specific group as part of the economy" , "Subdivision of area" , "Division of a nation's economy" , "Escort in zone" .)