Supplant, oust (8)
I believe the answer is:
displace
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">supplant</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">oust</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for displace that I've seen before include "Succeed" , "Shift" , "Remove from usual habitat" , "Oust" , "Supplant" .)