Cannon or rifle (3)
I believe the answer is:
gun
I believe this clue is a double definition.
'cannon' is the first definition.
(thesaurus)
'rifle' is the second definition.
(thesaurus)
(Other definitions for gun that I've seen before include "Hand weapon" , "Throttle" , "What has barrel" , "Platform from which to shoot" , "Revolver" .)