Story to follow on the radio (4)
I believe the answer is:
tale
'story' is the definition.
(I know that story can be written as tale)
'follow on the radio' is the wordplay.
'follow' becomes 'tail' (both can mean to chase or pursue).
'on the radio' indicates a 'sounds like' (homophone) clue.
'tail' is a homophone of 'TALE'.
'to' is the link.
(Other definitions for tale that I've seen before include "Story or anecdote" , "Narrative - fabrication" , "'Story, narrative (4)'" , "Fable" , "See 20" .)