Airport waiting area (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
gate
'airport waiting area' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for gate that I've seen before include "Movable opening" , "Attendance at a sporting event" , "Barrier - door" , "Entrance; street" , "Garden door?" .)