God and fool welcomed by supporter in US city (11)
I believe the answer is:
tallahassee
'us city' is the definition.
(city in Florida)
'god and fool welcomed by supporter in' is the wordplay.
'god' becomes 'allah' (Arabic name for God).
'and' says to put letters next to each other.
'fool' becomes 'ass' (both can mean a stupid person).
'welcomed by' is an insertion indicator (letters welcomed inside).
'supporter in' becomes 'tee' (I am not sure about this - if you are sure you should believe this answer much more).
'allah'+'ass'='allahass'
'allahass' placed into 'tee' is 'TALLAHASSEE'.
Can you help me to learn more?
(Other definitions for tallahassee that I've seen before include "US capital" , "A place in Florida" , "Florida city" , "Florida's sate capital" .)