Virtue of quiet uncultured number at church (8)
I believe the answer is:
prudence
'virtue' is the definition.
'quiet uncultured number at church' is the wordplay.
'quiet' becomes 'p' (music symbol for 'piano').
'uncultured' becomes 'rude'.
'number' becomes 'n'.
'at' says to put letters next to each other.
'church' becomes 'ce' (abbreviation for Church of England).
'p'+'rude'+'n'+'ce'='PRUDENCE'
'of' is the link.
(Other definitions for prudence that I've seen before include "showing caution" , "Caution; common sense" , "Caution; wisdom" , "Caution, circumspection" , "Care and thought for the future" .)