US state; capital Boise (5)

I believe the answer is:

idaho

(Other definitions for idaho that I've seen before include "State of NW US" , "NW state of USA" , "Pertaining to the Bard" , "Union member?" , "US state S. of Montana" .)

I've seen this clue in The Guardian and The Mirror.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.