Not rented (5)
I believe the answer is:
unlet
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not rented</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for unlet that I've seen before include "Not rented out" , "Still to be leased out" , "(Of property) with no tenant found" .)