Fire-arm (3)
I believe the answer is:
gun
I believe this clue is a double definition.
'fire' is the first definition.
(I know that gun is a more specific form of blast)
'arm' is the second definition.
(I know that gun is a type of arm)
(Other definitions for gun that I've seen before include "Platform from which to shoot" , "Hired killer" , "What has barrel" , "Throttle" , "Firearm" .)