Way to take part in broadcast (4)
I believe the answer is:
road
'way' is the definition.
(I know that road is a type of way)
'part in broadcast' is the wordplay.
'part in' says the answer is hidden in the clue.
'ROAD' is hidden in the letters of 'broadcast'.
'to take' is the link.
(Other definitions for road that I've seen before include "Way travelled by boat" , "motorway?" , "course" , "Abbey -, Beatles album" , "public highway" .)