Airport exit (4)
I believe the answer is:
gate
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">airport exit</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 gate that I've seen before include "Doorway" , "Plane-boarding point" , "Kind of door as in wall or fence" , "It may be barred" , "Field entrance" .)