North Yorkshire river (3)
'north yorkshire river' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for ure that I've seen before include "River of N. Yorkshire" , "Ripon's river" , "Midge --, singer" , "River at Ripon" , "Wensleydale river" .)
(Other definitions for esk that I've seen before include "Scottish river" , "River in Dumfries" , "River flowing into Solway Firth" , "Northern river" , "River in the Borders" .)