Injure, maim (8)
I believe the answer is:
mutilate
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">injure</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know this)</span><br/ ><br/ >'<span class="explanation-format__original">maim</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know this)</span><br/ ><br/ ></span>
(Other definitions for mutilate that I've seen before include "Damage very seriously" , "9 across (anag)" , "Severely maim" , "Cut off a part of the odd mule at it" , "Destroy" .)