Chicago airport (5)

I believe the answer is:
'chicago airport' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for ohare that I've seen before include "Chicago airport (1'4)" , "Chicago's main airport" .)
I've seen this clue in the Universal, The New York Times, the Newsday, the LA Times, The Wall Street Journal, the USA Today and the King Feature Syndicate.
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