Presiding officer in church broadcast (5)
I believe the answer is:
chair
'presiding officer' is the definition.
(chair is a kind of presiding officer)
'church broadcast' is the wordplay.
'church' becomes 'ch' (common abbreviation).
'broadcast' becomes 'air' (to air on TV).
'ch'+'air'='CHAIR'
'in' acts as a link.
(Other definitions for chair that I've seen before include "Senior academic post" , "Something with legs" , "president" , "rocker?" , "director at meeting" .)