Crossword Genius

Nest egg option, for short (3)

Ross

I believe the answer is:

ira

(Other definitions for ira that I've seen before include "Brother of George Gershwin" , "Illegal organisation, in short" , "Militant Irish nationalist organisation" , "Illegal organisation, initially" , "George Gershwin's older brother, the lyricist" .)

I've seen this clue in The New York Times.
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