Crossword Genius

Seine substance (3)

Ross

I believe the answer is:

eau

'seine substance' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for eau that I've seen before include "Popular toilet water - . . . de Cologne" , "Water in France" , "Quick to notice things" , "French water from chateaux" , "-- de vie" .)

I've seen this clue in The Wall Street Journal.
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