Polish a large ring in New York city (7)
I believe the answer is:
buffalo
'new york city' is the definition.
(city in New York state)
'polish a large ring' is the wordplay.
'polish' becomes 'buff' (buffing is a kind of polishing).
'large' becomes 'L' (eg in clothes sizes).
'ring' becomes 'O' (letter resembling a ring).
'buff'+'a'+'l'+'o'='BUFFALO'
'in' acts as a link.
(Other definitions for buffalo that I've seen before include "Large animal of the cattle family" , "Herd animal; New York port" , "Animal whose milk made mozzarella initially" , "Brown bison of North America" , "Large bovine animal" .)