Geneva's river (5)
I believe the answer is:
rhone
'geneva's river' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rhone that I've seen before include "River flowing through Lake Geneva" , "River running through France to the Med" , "French river from Alps to Mediterranean" , "River at Avignon and Arles" , "wine-producing area" .)