Maltreat male composer we hear (9)
I believe the answer is:
manhandle
'maltreat' is the definition.
(thesaurus)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for manhandle that I've seen before include "Give rough treatment to" , "Push (someone) about roughly" , "Treat roughly, or move by human effort alone" , "Knock around" , "Mistreat" .)