Crossword Genius

Rhone tributary (5)

Ross

I think it could be either:

saone

isere

'rhone tributary' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for isere that I've seen before include "French department" , "River and department of southeast France" , "somewhere in France" , "River of south-eastern France" , "part of France" .)

I've seen this clue in the Penny Press.
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