Stand against model put to work (6)
I believe the answer is:
oppose
'stand against' is the definition.
(I've seen this before)
'model put to work' is the wordplay.
'model' becomes 'pose' (model can mean to pose).
'put to' means one lot of letters go next to another.
'work' becomes 'op' (abbreviation for opus).
'pose' put after 'op' is 'OPPOSE'.
(Other definitions for oppose that I've seen before include "'Refute, stand against (6)'" , "Resist, be hostile to" , "Refute - confront" , "Compete with" , "Resist, go against" .)