Roughly treat male composer on the radio (9)
I believe the answer is:
manhandle
'roughly treat' is the definition.
(I've seen this before)
'male composer on the radio' is the wordplay.
'male' becomes 'man' (man is a kind of male).
'composer' becomes 'handel' (George Frideric Handel).
'on the radio' shows a homophone (sound like).
'handel' is a homophone of 'handle'.
'man'+'handle'='MANHANDLE'
(Other definitions for manhandle that I've seen before include "Mistreat" , "Push (someone) about roughly" , "Treat roughly, or move by human effort alone" , "Knock around" , "Give rough treatment to" .)