Cocktail of gin and vermouth (7)
I believe the answer is:
martini
'cocktail of gin and vermouth' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for martini that I've seen before include "Sienese painter" , "Gin or vodka with dry vermouth" , "In glass, one's dry" , "Italian drink" , "alcoholic drink" .)