Revolutionary is outside rabble-rousing? (9)
I believe the answer is:
seditious
'rabble-rousing?' is the definition.
('seditious' can be a synonym of 'rabble-rousing')
'revolutionary is outside' is the wordplay.
'revolutionary' is an anagram indicator.
'is'+'outside'='isoutside'
'isoutside' with letters rearranged gives 'SEDITIOUS'.
(Other definitions for seditious that I've seen before include "Inciting to revolt" , "undermining the state" , "inciting rebellion" , "Revolutionary" , "Subversive" .)