Solo male part rejected by composer (8)
I believe the answer is:
bachelor
'solo male' is the definition.
'bachelor' can be an answer for 'male' (bachelor is a kind of male). I'm not certain of the 'solo' bit.
'part rejected by composer' is the wordplay.
'part' becomes 'role' ('role' can be a synonym of 'part'**).
'rejected' says the letters should be written in reverse.
'by' says to put letters next to each other.
'composer' becomes 'bach' (Bach is an example).
'role' backwards is 'elor'.
'elor' after 'bach' is 'BACHELOR'.
Can you help me to learn more?
(Other definitions for bachelor that I've seen before include "Single person" , "Unmarried man (with a degree?)" , "Unmarried person" , "Graduate" , "Single man" .)