Stop limiting church in extra large religious region (7)
I believe the answer is:
diocese
'religious region' is the definition.
(area a bishop is responsible for)
'stop limiting church in extra large' is the wordplay.
'stop' becomes 'die' (I've seen this in other clues).
'limiting' means one lot of letters goes inside another.
'church' becomes 'ce' (abbreviation for Church of England).
'in' indicates putting letters inside.
'extra large' becomes 'os' (Over Size - library term for books).
'ce' inserted inside 'os' is 'oces'.
'die' going around 'oces' is 'DIOCESE'.
(Other definitions for diocese that I've seen before include "District under care of bishop" , "Jurisdiction of a bishop" , "District under a bishop's jurisdiction" , "District under a bishop's authority" , "Ecclesiastical see" .)