Italian composer - or cocktail (7)
I believe the answer is:
bellini
This clue is a double definition.
'italian composer' is the first definition.
(I've seen this before)
'cocktail' is the second definition.
(I've seen this before)
(Other definitions for bellini that I've seen before include "member of painting family" , "Cocktail; composer of opera Norma" , "Italian opera composer (Norma)" , "Italian composer of operas such as Norma (1831)" , "Peach juice cocktail" .)