Geneva's river (5)
I believe the answer is:
rhone
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">geneva's river</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(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" .)