City on the Truckee (4)
I believe the answer is:
reno
'city on the truckee' 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 "American city" , "Nevada gambling resort" , "City in Nevada noted for quickie divorces" , "City in Nevada known for casinos and easy divorces" , "City in Nevada known for gambling and easy marriage/divorce" .)