Fake map, one covering US city (9)
I believe the answer is:
charlatan
'fake' is the definition.
(both can mean a fraudulent person)
'map one covering us city' is the wordplay.
'map' becomes 'chart' (chart is a kind of map).
'one' becomes 'an' (an apple is one apple).
'covering' is an insertion indicator.
'us city' becomes 'LA' (Los Angeles).
'chart'+'an'='chartan'
'chartan' going around 'la' is 'CHARLATAN'.
(Other definitions for charlatan that I've seen before include "Impostor, deceiver" , "Quack, fraud, a flamboyant deceiver" , "Person who falsely claims to be an expert" , "ake" , "Pretender" .)