Means of exit (6)
I believe the answer is:
egress
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">means of exit</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 egress that I've seen before include "Way out or means of exit" , "At the right moment" , "W ay out" , "The act of going out" , "The act of leaving a building" .)