On radio man would listen (4)
I believe the answer is:
heed
'listen' is the definition.
(I know that listen can be written as heed)
'on radio man would' is the wordplay.
'on' is a charade indicator (letters next to each other).
'radio man' becomes 'hee' (I can't justify this - if you can you should give a lot more credence to this answer).
'would' becomes 'd' (as in 'we'd' - 'we would').
'hee'+'d' is 'HEED'.
Can you help me to learn more?
(Other definitions for heed that I've seen before include "Regard" , "Be mindful of" , "Take notice of" , "Mark" , "Consider" .)