Aromatic liqueur (10)
I believe the answer is:
chartreuse
'aromatic liqueur' is the definition.
(Chartreuse is a type of liqueur)
This is all the clue.
(Other definitions for chartreuse that I've seen before include "drink" , "Pale green-yellow colour" , "green liquid" , "Green-yellow liqueur" , "Carthusian liqueur" .)