Thoroughfare went on broadcast? (4)
I believe the answer is:
road
'thoroughfare' is the definition.
(a thoroughfare is a type of road)
'went on broadcast?' is the wordplay.
'went on' becomes 'rode' (I've seen this in another clue).
'broadcast?' shows a homophone (sound like) (how the word might sound on the radio or TV).
'rode' is a homophone of 'ROAD'.
(Other definitions for road that I've seen before include "Thoroughfare" , "mine gallery" , "'The . . . . to hell is paved with good intentions'" , "course" , "See 2" .)