___ de cologne (3)

I believe the answer is:

eau

(Other definitions for eau that I've seen before include "Perrier water" , "-- de vie" , "French water - de Cologne?" , "French water, may be Cologne" , "French water from chateaux" .)

I've seen this clue in the Newsday.com, the L.A. Times Daily, The Wall Street Journal, the King Feature Syndicate, the Universal, The New York Times, the LA Times, The Mirror, the USA Today, the Newsday and The Washington Post.

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