Hero of Western music man embarks on an affair (6)

'embarks on an affair' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'hero of western music man' is the wordplay.
I cannot really see how this works, but
'of' could be 'o' and 'o' is found in the answer.
'music' could be 'g' and 'g' is found within the answer.
'man' could be 'jan' and 'jan' is found in the answer.
A single letter 'd' remains which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?