Top weapon? (3)
I believe the answer is:
gun
This clue might be a double definition.
'top' is the first definition.
The definition and answer 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?
'weapon?' is the second definition.
(gun is a kind of weapon)
Can you help me to learn more?
(Other definitions for gun that I've seen before include "It can be carried by 15 Ac" , "Firearm" , "An offensive weapon" , "Artillery piece" , "Throttle" .)