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' says to put letters next to each other.
'part played' becomes 'role' (I can't explain this - if you can you should give a lot more credence to this answer).
'back' says the letters should be written in reverse.
'role' backwards is 'elor'.
'bach'+'elor'='BACHELOR'
'for' is the 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" .)