Broadcast race (5)
I believe the answer is:
relay
I believe this clue is a double definition.
'broadcast' is the first definition.
(I've seen this before)
'race' is the second definition.
(relay race)
(Other definitions for relay that I've seen before include "Receive and pass on - race" , "track event" , "Team of workers" , "article in bank" , "Hand, pass on" .)