Yorkshire valley (4)
I believe the answer is:
dale
'yorkshire valley' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for dale that I've seen before include "Valley; old radio soap family" , "Valley; Trollope's Bell and Lily" , "Up hill and down . . . ." , "Lead into poetic valley" , "Valley, as in Yorkshire" .)