Oklahoma city (5)
I believe the answer is:
tulsa
'oklahoma city' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for tulsa that I've seen before include "City in Oklahoma featured in a 60s song" , "Major oil centre" , "Oklahoma river port" , "Twenty-four Hours from - (Gene Pitney)" , "Where in the States" .)