In a frenzy (4)
I believe the answer is:
amok
'in a frenzy' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for amok that I've seen before include "Running wild" , "going wild" , "In an uncontrolled, often violent, way" , "Run thus to run wildly about" , "Run (disruptively out of control)" .)