Wicked conduct (4)
I believe the answer is:
vice
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">wicked conduct</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 vice that I've seen before include "Workshop tool - bad habit" , "Gripper -- fault" , "item in workshop" , "Strong gripper" , "Wrong" .)