Church feature to change we hear (5)
I believe the answer is:
altar
'church feature' is the definition.
(I've seen this in another clue)
'change we hear' is the wordplay.
'change' becomes 'alter' (synonyms).
'we hear' shows a homophone (sound like).
'alter' is a homophone of 'ALTAR'.
'to' is the link.
(Other definitions for altar that I've seen before include "Sacred table" , "Focus of religious activity" , "Kind of table for religious ceremonies" , "Church focal point" , "Table used for religious ceremony" .)