Sailor to err with the drink (8)
I believe the answer is:
absinthe
'drink' is the definition.
(absinthe is a kind of drink)
'sailor to err with the' is the wordplay.
'sailor' becomes 'ab' (abbreviation for able seaman).
'to err' becomes 'sin' (I've seen this in another clue).
'with' says to put letters next to each other.
'ab'+'sin'+'the'='ABSINTHE'
(Other definitions for absinthe that I've seen before include "Strong liquour in the basin?" , "intoxicant" , "Bathes in strong liquour, strangely" , "Green liqueur flavoured with wormwood and anise" , "Potent aniseed-flavoured drink" .)