Revolutionary is outside, revolting (9)
I believe the answer is:
seditious
'revolutionary' is the definition.
(thesaurus)
'is outside revolting' is the wordplay.
'revolting' indicates an anagram.
'is'+'outside'='isoutside'
'isoutside' is an anagram of 'SEDITIOUS'.
(Other definitions for seditious that I've seen before include "undermining the state" , "Revolutionary" , "inciting rebellion" , "Subversive" , "Rabble-rousing" .)