George's brother (3)
I believe the answer is:
ira
'george's brother' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ira that I've seen before include "George Gershwin's older brother, the lyricist" , "Illegal organisation, in short" , "terrorists" , "Illegal organisation, initially" , "Songwriter George's elder brother" .)