Bad way to run (4)
I believe the answer is:
amok
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bad way to run</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for amok that I've seen before include "A state of murderous frenzy" , "(Run) in murderous frenzy" , "'Wildly, without self-control (4)'" , "Running wild" , "Uncontrolled or murderous way to run!" .)