Offensive uprising (9)
I believe the answer is:
revolting
I believe this is a double definition.
'offensive' is the first definition.
(similar in meaning)
'uprising' is the second definition.
(I know that uprising can be written as revolting)
(Other definitions for revolting that I've seen before include "Repulsive" , "Disgusting" , "Rising in rebellion" , "Loathsome" , "rioting" .)