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