Drambuie and Scotch cocktail (5,4)
I believe the answer is:
rusty nail
'drambuie and scotch cocktail' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rusty nail that I've seen before include "Strong sweet cocktail" , "one's likely to get hammered!" , "one drunk at cocktail party?" .)