Change feature of church for broadcast (5)
I believe the answer is:
alter
'change' is the definition.
('alter' can be a synonym of 'change')
'feature of church for broadcast' is the wordplay.
'feature of church' becomes 'altar'.
'for broadcast' shows a homophone (sound like).
'altar' sounds like 'ALTER'.
(Other definitions for alter that I've seen before include "Change, make different" , "Change, modify" , "Revise" , "Alert to change" , "shift" .)