Prudence to furnish new church (10)
I believe the answer is:
providence
'prudence' is the definition.
(providence is a kind of prudence)
'furnish new church' is the wordplay.
'furnish' becomes 'provide' (synonyms).
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'church' becomes 'CE' (abbreviation for Church of England).
'provide'+'n'+'ce'='PROVIDENCE'
'to' acts as a link.
(Other definitions for providence that I've seen before include "US state capital" , "fortune" , "tender care" .)