Sham Jerry raking in back payments (6)
I believe the answer is:
pseudo
'sham' is the definition.
(synonyms)
'jerry raking in back payments' is the wordplay.
'jerry' becomes 'po' (both can mean a chamber pot).
'raking in' indicates putting letters inside.
'back' is a reversal indicator.
'payments' becomes 'dues' (dues are a fee or charge).
'dues' written backwards gives 'seud'.
'po' enclosing 'seud' is 'PSEUDO'.
(Other definitions for pseudo that I've seen before include "'Fake, sham (6)'" , "False - souped (anag)" , "artificial" , "Pretentious, insincere" , "Prefix meaning false; o dupes!" .)