Want to work on radio? (4)
I believe the answer is:
need
'want' is the definition.
(I know this)
'work on radio?' is the wordplay.
'work' becomes 'knead' (synonyms).
'on radio?' shows a homophone (sound like) (I've seen 'on radio' mean this).
'knead' is a homophone of 'NEED'.
'to' acts as a link.
(Other definitions for need that I've seen before include "A condition" , "state requiring relief" , "Necessity" , "Distressful situation" , "Penury" .)