Composer has part played back for a single man (8)
I believe the answer is:
bachelor
'a single man' is the definition.
(unmarried man)
'composer has part played back' is the wordplay.
'composer' becomes 'bach' (Johann Sebastian Bach).
'has' is a charade indicator (letters next to each other).
'part played' becomes 'role' (I can't justify this - if you can you should give a lot more credence to this answer).
'back' says the letters should be written backwards.
'role' written backwards gives 'elor'.
'bach'+'elor'='BACHELOR'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for bachelor that I've seen before include "Unmarried person" , "he has no ties" , "Non-married male" , "Unmarried man (with a degree?)" , "Single person" .)