Anger in agricultural business -- one gets fired (7)
I believe the answer is:
firearm
'one gets fired' is the definition.
'anger in agricultural business' is the wordplay.
'anger' becomes 'ire' ('ire' can be a synonym of 'anger').
'in' means one lot of letters goes inside another.
'agricultural business' becomes 'farm' (I've seen this before).
'ire' put within 'farm' is 'FIREARM'.
(Other definitions for firearm that I've seen before include "Colt perhaps" , "Pistol, rifle or gun" , "piece" , "Colt possibly" , "Hand-held weapon" .)