Indian cooking style needs extra American port (9)
I believe the answer is:
baltimore
'american port' is the definition.
'indian cooking style needs extra' is the wordplay.
'indian cooking style' becomes 'balti'.
'needs' is a charade indicator (letters next to each other).
'extra' becomes 'more' (I've seen this before).
'balti'+'more'='BALTIMORE'
(Other definitions for baltimore that I've seen before include "Port on Chesapeake Bay" , "Large city in Maryland" , "Largest city of Maryland, USA" , "US city" , "City north-east of Washington DC" .)