A sailor’s in the drink (8)
I believe the answer is:
absinthe
'drink' is the definition.
(absinthe is a kind of drink)
'a sailor's in the' is the wordplay.
'a sailor's' becomes 'abs' (abbreviation for able seaman).
'abs'+'in'+'the'='ABSINTHE'
(Other definitions for absinthe that I've seen before include "Liqueur - the basin (anag)" , "Green aniseed liqueur" , "French liqueur" , "intoxicant" , "Aniseed flavoured liqueur" .)