State west of Wyo. (3)

I believe the answer is:

ida

(Other definitions for ida that I've seen before include "Greek mount - Gilbertian princess" , "Girl's name; aid (anag.)" , "Princess __ (G&S comic opera)" , "'Princess - - ' (G & S)" , "noted princess" .)

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

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