In debt, fee adjustment helped (9)
I believe the answer is:
benefited
'helped' is the definition.
(benefiting is a kind of helping)
'in debt fee adjustment' is the wordplay.
'adjustment' indicates an anagram (the order of letters is adjusted).
'in'+'debt'+'fee'='indebtfee'
'indebtfee' is an anagram of 'BENEFITED'.
(Other definitions for benefited that I've seen before include "Gained" , "reaped financial reward" .)