Entry at gunpoint (4)
I believe the answer is:
gate
This could be a double definition.
'entry' is the first definition.
(I've seen this in another clue)
'gunpoint' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'at' is the link.
Can you help me to learn more?
(Other definitions for gate that I've seen before include "Confine to college" , "Portal" , "Entrance; street" , "Entry barrier as to field" , "Frame for closing an entrance" .)