Impede, burden (8)
I believe the answer is:
encumber
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">impede</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">burden</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for encumber that I've seen before include "Impede, burden" , "Constrain" , "Burden with, oppress (8)" , "Restrict or impede" , "Be a burden to, place load on" .)