Leave, depart (4)
I believe the answer is:
exit
This clue is a double definition.
'leave' is the first definition.
(I know that leave can be written as exit)
'depart' is the second definition.
(I know that depart is a kind of exit)
(Other definitions for exit that I've seen before include "Road leaving motorway" , "Player's departure" , "Departure of actor" , "farewell!" , "Leave the stage" .)