Tequila citrus cocktail (9)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
margarita
(Other definitions for margarita that I've seen before include "Tequila and lime cocktail" , "Stiff drink" , "Type of tequila cocktail" , "Tequila-based cocktail" , "Cocktail consisting of tequila and lemon juice" .)