Bitter orange liqueur (7)
I believe the answer is:
curacao
'bitter orange liqueur' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for curacao that I've seen before include "Spirit" , "Liqueur flavoured with bitter orange peel" , "Caribbean island and bitter orange liqueur" , "Island in the Dutch Antilles" , "Orange-flavoured liqueur" .)