Emergency exit (4,6)
I believe the answer is:
fire escape
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">emergency exit</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for fire escape that I've seen before include "Emergency exit" , "it could be a life-saver" , "Emergency way out" , "Evacuation staircase" , "Emergency flight perhaps" .)