Sun Valley's state (5)

I believe the answer is:

idaho

'sun valley's state' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for idaho that I've seen before include "US state in the Rocky Mountains" , "somewhere in the US" , "Another state" , "silver-mining state" , "One of 22 Across, capital Boise" .)

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

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