Broadcast the race (5)
I believe the answer is:
relay
I believe this is a double definition.
'broadcast' is the first definition.
(relay can mean to broadcast or pass on)
'race' is the second definition.
(relay race)
'the' acts as a link.
(Other definitions for relay that I've seen before include "track event" , "Hand, pass on" , "Pass on - put down again" , "article in bank" , "Receive and pass on - race" .)