Casino city (4)
I believe the answer is:
reno
'casino city' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for reno that I've seen before include "Nevada city of Nero" , "Divorce capital of Nevada" , "Nevadan city" , "Nevada marriage and divorce centre" , "City in Nevada known for casinos and easy divorces" .)