Sailor to stray with the drink (8)
I believe the answer is:
absinthe
'drink' is the definition.
(absinthe is a kind of drink)
'sailor to stray with the' is the wordplay.
'sailor' becomes 'ab' (abbreviation for able seaman).
'to stray with' becomes 'sin' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'ab'+'sin'+'the'='ABSINTHE'
Can you help me to learn more?
(Other definitions for absinthe that I've seen before include "Potent green gin-type liquor - wormwood" , "Green wormwood drink" , "Strong green liqueur, lethal when made with wormwood" , "Liqueur originally containing wormwood" , "Aniseed-flavoured liqueur" .)