Gin and vermouth cocktail (7)
I believe the answer is:
martini
'gin and vermouth cocktail' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for martini that I've seen before include "Cocktail made with gin or vodka and vermouth" , "Gin or vodka with dry vermouth" , "In glass, one's dry" , "Alternative name for Simone Memmi, pre-Renaissance Italian painter" , "obtained from a bottle" .)