Tin Pan Alley's Gershwin (3)

I believe the answer is:

ira

(Other definitions for ira that I've seen before include "George Gershwin's older brother, the lyricist" , "nationalists" , "Militant republicans" , "Brother of George Gershwin" , "Gershwin, say" .)

I've seen this clue in The Wall Street Journal.

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