Reorganisation (5-2)
I believe the answer is:
shake-up
'reorganisation' is the definition.
(I know that reorganisation can be written as shake-up)
This is all the clue.
(Other definitions for shake-up that I've seen before include "Major reorganisation" , "Fundamental change" , "Drastic reorganisation" , "Radical reorganization" , "Disturbance: reorganisation" .)