Waterway through Lake Geneva (5)

I believe the answer is:

rhone

(Other definitions for rhone that I've seen before include "wherein runs rain in Arbroath" , "River flowing from Alps to the French Med" , "River at Avignon and Arles" , "River running through the city of Arles" , "One following long course" .)

I've seen this clue in The New York Times.

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