Tool; cocktail (11)
I believe the answer is:
screwdriver
I believe this clue is a double definition.
'tool' is the first definition.
(screwdriver is a kind of tool)
'cocktail' is the second definition.
(I know that Screwdriver is a type of cocktail)
(Other definitions for screwdriver that I've seen before include "Hand tool - cocktail" , "Woodworker's tool" , "Cocktail (vodka and 4 down juice)" , "Drink" , "Cocktail of vodka and orange juice" .)