Run this way to go berserk (4)

I believe the answer is:

amok

(Other definitions for amok that I've seen before include "Frenziedly" , "going wild" , "Frenzied, running out of control" , "Run thus to be wild and uncontrolled" , "In an uncontrolled, often violent, way" .)

I've seen this clue in The Guardian.

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