Presided over church broadcast (7)
I believe the answer is:
chaired
'presided' is the definition.
('chair' can be a synonym of 'preside')
'over church broadcast' is the wordplay.
'over' means one lot of letters go next to another.
'church' becomes 'ch' (common abbreviation).
'broadcast' becomes 'aired' (synonyms).
'ch' next to 'aired' is 'CHAIRED'.
(Other definitions for chaired that I've seen before include "Led (meeting)" , "Looked after meeting" .)