Mistreat (5)
I believe the answer is:
abuse
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mistreat</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for abuse that I've seen before include "Utter insults, attack in words" , "Treat badly; insult" , "Bully" , "Revile" , "Improper treatment" .)