Lent ear to broadcast -- it's never-ending (7)
I believe the answer is:
eternal
'never-ending' is the definition.
(both can mean lasting forever)
'lent ear to broadcast' is the wordplay.
'to broadcast' indicates an anagram (letters scattered or cast around).
'lent'+'ear'='lentear'
'lentear' anagrammed gives 'ETERNAL'.
'it's' is the link.
(Other definitions for eternal that I've seen before include "going on for ever" , "Undying" , "Never failing" , "Timeless" , "Such a city is Rome" .)