City where the Saône joins the Rhône (4)
I believe the answer is:
lyon
'city where the saone joins the rhone' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for lyon that I've seen before include "City where the Saone joins the Rhone" , "River port of southeast France" , "French city on the Rhone" , "River port, capital of the Rhone department" , "Southern French city" .)