Crossword Genius

State that, unfortunately, one must retire to read (4)

Ross

I believe the answer is:

utah

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'state' is the definition.
(Utah is an example)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for utah that I've seen before include "State of Western USA" , "US state, capital Salt Lake City" , "State, Mormon settlement" , "American state associated with Mormons and their faith" , "State of western US" .)

I've seen this clue in The Times.
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