Only state whose seal was designed by a woman (Emma Edwards Green, 1891) (5)

I believe the answer is:

idaho

(Other definitions for idaho that I've seen before include "State of NW US" , "somewhere in the US" , "US state S. of Montana" , "American state, capital Boise (5)" , "Pertaining to the Bard" .)

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

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