Revolt, rise up (5)
I believe the answer is:
rebel
This clue is a double definition.
'revolt' is the first definition.
(I've seen this in another clue)
'rise up' is the second definition.
(synonyms)
(Other definitions for rebel that I've seen before include "Revolt, mutiny" , "One who opposes the powerful" , "Disobey" , "Show dissent" , "Authority fighter" .)