Revolving set about to cause problems (3,2)
I believe the answer is:
act up
'to cause problems' is the definition.
I can't tell whether this defines the answer.
'revolving set about' is the wordplay.
'revolving' says the letters should be written backwards.
'set' becomes 'put' (synonyms).
'about' becomes 'ca' (abbreviation for 'circa').
'put'+'ca'='putca'
'putca' back-to-front is 'ACT UP'.
Can you help me to learn more?
(Other definitions for act up that I've seen before include "Misbehave - carry on" , "Mess about" , "malfunction" , "create fireworks display?" , "Become unpleasant" .)