Crossword Genius

In revolt (2,2,4)

Ross

I believe the answer is:

up in arms

(Other definitions for up in arms that I've seen before include "Protesting angrily - with weapons aloft?" , "Protesting vigorously, in militant mood" , "Openly protesting" , "Prepared to protest strongly" , "Protesting vigorously - got guns?" .)

I've seen this clue in The Times.
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