Crossword Genius

Amount of film about flat deserted US city (9)

Ross

I believe the answer is:

cleveland

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'us city' is the definition.
(city in Ohio)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for cleveland that I've seen before include "US President?" , "Northeast English county, created 1974" , "former President" , "past president" , "Democrat leader once" .)

I've seen this clue in The Independent.
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