Rum, coconut milk and pineapple cocktail (4,6)
I believe the answer is:
pina colada
(Other definitions for pina colada that I've seen before include "rum-based potation" , "Perhaps contents of cocktail glass" , "Cocktail of rum, pineapple juice and coconut" , "Drink made of pineapple juice, coconut cream and rum" , "alcoholic one" .)