"I thought of a joke about ___, but it's too corny" (groaner) (4)

I believe the answer is:

iowa

(Other definitions for iowa that I've seen before include "Central US state" , "American state, capital Des Moines" , "US state, three vowels" , "US state, capital Des Moines" , "State of USA" .)

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

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