One not paid by unruly tune-lover (9)
I believe the answer is:
volunteer
'one not paid' is the definition.
I can't tell whether this definition defines the answer.
'unruly tune-lover' is the wordplay.
'unruly' indicates anagramming the letters.
'tune'+'lover'='tunelover'
'tunelover' is an anagram of 'VOLUNTEER'.
'by' acts as a link.
Can you help me to learn more?
(Other definitions for volunteer that I've seen before include "Put forward, suggest" , "One enlisting of own free will" , "Without being asked" , "One works in an unpaid capacity" , "Opposite of conscript" .)