Charter a diocese partly for broadcast (5)
I believe the answer is:
radio
'broadcast' is the definition.
(radio broadcast is a kind of broadcast)
'charter a diocese partly' is the wordplay.
'partly' indicates a hidden word.
'RADIO' is hidden in the letters of 'charter a diocese'.
'for' acts as a link.
(Other definitions for radio that I've seen before include "Broadcaster" , "It used to be called the wireless" , "Contact" , "listening device" , "MW, LW or FM sound source" .)