City west of Tulsa (4)
I believe the answer is:
enid
'city west of tulsa' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for enid that I've seen before include "Writer of children's books, d. 1968" , "W - - Blyton" , "Geraint's loved one" , "Lady" , "Woman" .)