To live in support of church involves routine strength (5,5)
I believe the answer is:
brute force
'strength' is the definition.
(thesaurus)
'to live in support of church involves routine' is the wordplay.
'to live in support of' becomes 'befor' (I can't justify this - if you can you should give a lot more credence to this answer).
'church' becomes 'ce' (abbreviation for Church of England).
'involves' indicates putting letters inside.
'routine' becomes 'rut' (rut is a kind of routine).
'befor'+'ce'='beforce'
'beforce' placed around 'rut' is 'BRUTE FORCE'.
Can you help me to learn more?
(Other definitions for brute force that I've seen before include "Sheer physical strength" , "violence" .)