Oversee church music (5)
I believe the answer is:
chair
'oversee' is the definition.
(thesaurus)
'church music' is the wordplay.
'church' becomes 'ch' (common abbreviation).
'music' becomes 'air' (air is a kind of music).
'ch'+'air'='CHAIR'
(Other definitions for chair that I've seen before include "Professorship" , "Presiding officer" , "Something with legs" , "Supporter" , "Item of furniture (which can be addressed!)" .)