Aniseed liqueur (8)
I believe the answer is:
absinthe
'aniseed liqueur' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for absinthe that I've seen before include "intoxicant" , "Green wormwood drink" , "French liqueur" , "Strong liquour in the basin?" , "Liqueur - the basin (anag)" .)