Use badly (3-5)
I believe the answer is:
ill-treat
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">use badly</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ill-treat that I've seen before include "Use someone badly or cruelly" , "Misuse" , "Subject to cruel or abusive usage" , "Act cruelly towards (someone)" , "Abuse" .)