Crossword Genius

U.S. city elegant in the past (7)


I believe the answer is:


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But I can't explain it at all! Could you help me understand?

(Other definitions for chicago that I've seen before include "Al Capone's city" , "A Windy City in Illinois" , "Type of bridge" , "3 city in the US" , "US city, original home of the skyscraper" .)

I've seen this clue in The Hindu.
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