Substitutes put up with evil (6,2)
I believe the answer is:
stands in
'substitutes' is the definition.
('stand in' can be a synonym of 'substitute')
'put up with evil' is the wordplay.
'put up' becomes 'stand' (to put with something is to stand or endure it).
'with' is a charade indicator (letters next to each other).
'evil' becomes 'sin' (I've seen this before).
'stand'+'sin'='STANDS IN'
(Other definitions for stands in that I've seen before include "Substitutes" , "Acts as sub" , "Deputises" , "Acts as a substitute" , "acts for the moment" .)