Somewhere in the subcontinent, fighting, dropping note and letter from Greece (7)
I believe the answer is:
karachi
'somewhere in the subcontinent fighting dropping' is the definition.
I can't tell whether this definition defines the answer.
'note and letter from greece' is the wordplay.
'note' becomes 'kara' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'and' is a charade indicator (letters next to each other).
'letter from greece' becomes 'chi' (letter from the Greek alphabet).
'kara'+'chi'='KARACHI'
Can you help me to learn more?
(Other definitions for karachi that I've seen before include "Pakistani port" , "Pakistani seaport and former capital" , "City/port of Pakistan" , "Pakistani city" , "Pakistan port, once capital" .)