Report learning about American Indian city (9)
I believe the answer is:
bangalore
'indian city' is the definition.
(I've seen this before)
'report learning about american' is the wordplay.
'report' becomes 'bang' (report can mean a loud noise).
'learning' becomes 'lore' (both can mean tradition or knowledge).
'about' means one lot of letters go next to another.
'american' becomes 'a' (common abbreviation - e.g. in organisation names).
'lore' after 'a' is 'alore'.
'bang'+'alore'='BANGALORE'
(Other definitions for bangalore that I've seen before include "city in India" , "Asian city" , "State capital" , "Indian city" .)