Leave empty (6)
I believe the answer is:
vacate
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">leave empty</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 vacate that I've seen before include "Leave (a position)" , "Quit" , "Clear out and leave empty" , "Caveat - cease to occupy" , "Depart from, leave empty" .)