Italian's refusal to feed birds (7)
I believe the answer is:
genoese
'italian's' is the definition.
(I've seen this before)
'refusal to feed birds' is the wordplay.
'refusal' becomes 'no' (it's a no).
'to feed' indicates putting letters inside (inserted letters are fed into the word).
'birds' becomes 'geese' (goose is a kind of bird).
'no' put within 'geese' is 'GENOESE'.
(Other definitions for genoese that I've seen before include "Coming from the birthplace of Christopher Columbus" , "Italian port's" , "From an Italian port" , "people like Columbus" , "Columbus, for one" .)