French water (3)

I believe the answer is:

eau

'french water' is the definition.
('water' in French)

This is the entire clue.

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

I've seen this clue in The Washington Post and the Newsday.

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