Not all are belligerent, subversive (5)
I believe the answer is:
rebel
'subversive' is the definition.
(rebel is a kind of subversive)
'not all are belligerent' is the wordplay.
'not all' indicates the answer is hidden within the clue.
'REBEL' is hidden in the letters of 'are belligerent'.
(Other definitions for rebel that I've seen before include "Rise up - dissent" , "Dissident" , "Bolshy" , "Disobey" , "Rise up (without a cause?)" .)