Unusually bathes in drink (8)
I believe the answer is:
absinthe
'drink' is the definition.
(absinthe is a kind of drink)
'unusually bathes in' is the wordplay.
'unusually' indicates anagramming the letters.
'bathes'+'in'='bathesin'
'bathesin' anagrammed gives 'ABSINTHE'.
(Other definitions for absinthe that I've seen before include "Potent aniseed-flavoured drink" , "Strong liquour in the basin?" , "Liqueur - the basin (anag)" , "Green aniseed liqueur" , "Strong green liqueur, lethal when made with wormwood" .)