Work involving payments recalled as sham (6)
I believe the answer is:
pseudo
'sham' is the definition.
(I know that sham can be written as pseudo)
'work involving payments recalled' is the wordplay.
'work' becomes 'op' (short for opus).
'involving' indicates putting letters inside.
'payments' becomes 'dues' (dues are a fee or charge).
'recalled' says the letters should be written in reverse (to recall can mean to bring something back).
'op' going around 'dues' is 'oduesp'.
'oduesp' reversed gives 'PSEUDO'.
'as' acts as a link.
(Other definitions for pseudo that I've seen before include "Prefix meaning false; o dupes!" , "Fake, pretentious" , "Prefix for fake" , "Insincere person" , "Pretentious, insincere" .)