Deaden, desensitise (4)
I believe the answer is:
numb
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">deaden</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">desensitise</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(numbing is a kind of desensitizing)</span><br/ ><br/ ></span>
(Other definitions for numb that I've seen before include "Lacking feeling" , "Stinks" , "Deprived of feeling" , "Insensitive" , "Insensate" .)