Strong liqueur flavoured with wormwood and anise (8)
I believe the answer is:
absinthe
(Other definitions for absinthe that I've seen before include "Aniseed flavoured liqueur" , "Liqueur - the basin (anag)" , "Aniseed-flavoured liqueur" , "Green aniseed liqueur" , "Strong green liqueur, lethal when made with wormwood" .)