Dislocate, disunite (8)
I believe the answer is:
disjoint
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">dislocate</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">disunite</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that disunite can be written as disjoint)</span><br/ ><br/ ></span>
(Other definitions for disjoint that I've seen before include "break up" , "Make incoherent" .)