Crossword Genius

Radical shake-up (8)

Ross

I believe the answer is:

upheaval

(Other definitions for upheaval that I've seen before include "Violent change or disturbance" , "Violent or sudden change or disruption" , "Disruptive disturbance" , "State of violent disturbance and disorder" , "Turbulence" .)

I've seen this clue in The Guardian.
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