Anger about loud weapon (5)
I believe the answer is:
rifle
'weapon' is the definition.
(rifle is a kind of weapon)
'anger about loud' is the wordplay.
'anger' becomes 'rile' (I've seen this in other clues).
'about' indicates putting letters inside.
'loud' becomes 'f' (A musical term**).
'rile' going around 'f' is 'RIFLE'.
(Other definitions for rifle that I've seen before include "Gun; sack" , "An arm" , "Rummage" , "Strip - firearm" , "shoot?" .)