Protest is about money (3-2)
I believe the answer is:
sit-in
'protest' is the definition.
(sit-in is a type of non-violent protest)
'is about money' is the wordplay.
'about' says the letters should be written in reverse.
'money' becomes 'tin' (old-fashioned slang term for money).
'is' reversed gives 'si'.
'si'+'tin'='SIT-IN'
(Other definitions for sit-in that I've seen before include "Seated protest" , "Type of demo" , "Factory protest" , "Occupation of a place as a protest" , "Passive occupation of a premises" .)