Revolting beast rising (9)
I believe the answer is:
rebellion
'rising' is the definition.
(I know that rising can be written as rebellion)
'revolting beast' is the wordplay.
'revolting' becomes 'rebel' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'beast' becomes 'lion' (type of animal).
'rebel'+'lion'='REBELLION'
Can you help me to learn more?
(Other definitions for rebellion that I've seen before include "Uprising" , "Revolting" , "insurgence" , "Insurgency" , "Coup d'tat" .)