Stand in (for) (8)
I believe the answer is:
deputise
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">stand in for</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for deputise that I've seen before include "Stand in for" , "Appoint as a substitute" , "Appoint as representative" , "Appoint as stand-in" , "Act as delegate for a person" .)