Irishman's fit of temper (5)
I believe the answer is:
paddy
This clue is a double definition.
'irishman's' is the first definition.
(Paddy is an example)
'fit of temper' is the second definition.
(I've seen this before)
(Other definitions for paddy that I've seen before include "Wobbly" , "Temper tantrum" , "show of anger" , "Rice field; fit of temper" , "Field where rice is grown" .)