Escape route (4)
I believe the answer is:
exit
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">escape route</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 exit that I've seen before include "Depart" , "Escape route?" , "Outlet" , "Way to leave" , "[DOOR] ?" .)