Bird that's additional to Indian dish (9)
I believe the answer is:
baltimore
'bird' is the definition.
(Baltimore bird is an example)
'additional to indian dish' is the wordplay.
'additional' becomes 'more' ('more' can be a synonym of 'additional').
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'indian dish' becomes 'balti' (I've seen this before).
'more' after 'balti' is 'BALTIMORE'.
'that's' is the link.
(Other definitions for baltimore that I've seen before include "City of north Maryland" , "City north-east of Washington DC" , "Large city in Maryland" , "Largest city of Maryland, USA" , "US city" .)