It's often gained by knocking (5)
I believe the answer is:
entry
(Other definitions for entry that I've seen before include "vestibule" , "Lobby" , "Door, access" , "Admittance" , "Doorway" .)
I believe the answer is:
entry
(Other definitions for entry that I've seen before include "vestibule" , "Lobby" , "Door, access" , "Admittance" , "Doorway" .)