Maybe neon light moving left across city (7)
I believe the answer is:
glasgow
'city' is the definition.
(Glasgow is an example)
'maybe neon light moving left across' is the wordplay.
I cannot really understand how this works, but
'left' could be 'l' (common abbreviation) and 'l' is located in the answer.
'neon' could be 'gas' (I've seen this in another clue) and 'gas' is found within the leftover letters.
This may be the basis of the clue (or it may be nonsense).
(Other definitions for glasgow that I've seen before include "Scotland's largest city" , "Scottish city on the Clyde" , "European City of Culture, 1990" , "City of bad low gags" , "Sauchiehall St. city" .)