Song, where it’s found, and how one’s done? (5,6)
I believe the answer is:
track record
'how one's done?' is the definition.
(how you've done in the past)
'song where it's found' is the wordplay.
I cannot quite see how this works, but
'song' could be 'track' (I've seen this before) and 'track' is present in the answer.
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is found within the answer.
This explanation may well be incorrect...
'and' acts as a link.
(Other definitions for track record that I've seen before include "History" , "Background" , "(A person's) past achievements" , "Previous performance" , "Past account" .)