Hot (temper?) (5)
'hot temper' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ire that I've seen before include "Paddy" , "Choler" , "Fury" , "Outrage" , "Losing head" .)
(Other definitions for fiery that I've seen before include "Intensely hot" , "Hot-tempered, passionate" , "Choleric" , "irascible" , "Explosive (e.g. temper)" .)