Cut a liver out -- it's financially rewarding (9)
I believe the answer is:
lucrative
'financially rewarding' is the definition.
(lucrative can mean profitable or well-paid)
'cut a liver out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'cut'+'a'+'liver'='cutaliver'
'cutaliver' with letters rearranged gives 'LUCRATIVE'.
'it's' acts as a link.
(Other definitions for lucrative that I've seen before include "Highly profitable" , "Well-paid" , "Making a great profit" , "rewarding" , "Revictual (anag.)" .)