Stand-in doctor (5)
I believe the answer is:
locum
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">stand-in doctor</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for locum that I've seen before include "temporary occupant" , "one won't be in position for ever!" , "A substitute or stand-in doctor" , "Stand-in, for a doctor say" , "Doctor's deputy" .)