In a frenzy (4)
I believe the answer is:
amok
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">in a frenzy</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(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)" .)