Sparks neighbor (4)
I believe the answer is:
reno
'sparks neighbor' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for reno that I've seen before include "Divorce capital of Nevada" , "US divorce centre" , "US gambling resort" , "City in Nevada known for casinos and easy divorces" , "City in Nevada known for gambling and easy marriage/divorce" .)