Upheaval (7)
I believe the answer is:
turmoil
'upheaval' is the definition.
(I know that upheaval can be written as turmoil)
This is all the clue.
(Other definitions for turmoil that I've seen before include "agitating activity" , "Pandemonium" , "State of great commotion or disturbance" , "Unrest - upheaval" , "Chaos" .)