Protest against work on model (6)
I believe the answer is:
oppose
'protest' is the definition.
(I know that protest is a more specific form of the action oppose)
'against work on model' is the wordplay.
'against' says to put letters next to each other.
'work on' becomes 'op' (abbreviation for opus. I am not sure about the 'on' bit.).
'model' becomes 'pose' (model can mean to pose).
'op' next to 'pose' is 'OPPOSE'.
Can you help me to learn more?
(Other definitions for oppose that I've seen before include "face" , "Resist; disapprove of" , "Actively resist" , "Resist, go against" , "'Refute, stand against (6)'" .)