Get angry, grabbing fine weapon (5)
I believe the answer is:
rifle
'weapon' is the definition.
(rifle is a kind of weapon)
'get angry grabbing fine' is the wordplay.
'get angry' becomes 'rile'.
'grabbing' means one lot of letters goes inside another.
'fine' becomes 'f' (abbreviation).
'rile' enclosing 'f' is 'RIFLE'.
(Other definitions for rifle that I've seen before include "Ransack; a weapon" , "Lifer (anag.)" , "Sack; firearm" , "Rummage" , "One that has stock" .)