Title rumoured for composer (6)
I believe the answer is:
handel
'for composer' is the definition.
(George Frideric Handel)
'title rumoured' is the wordplay.
'title' becomes 'handle' (handle can mean a name).
'rumoured' indicates a 'sounds like' (homophone) clue (a rumour is something you hear).
'handle' is a homophone of 'HANDEL'.
(Other definitions for handel that I've seen before include "German composer, lived in England" , "Old musician" , "music-maker" , "German composer of Messiah" , "German-born composer to the ` `Messiah' '" .)