Drink a six-pack? Then I will get drunk! (8)
I believe the answer is:
absinthe
'drink' is the definition.
(absinthe is a kind of drink)
'a six-pack? then i will get drunk' is the wordplay.
'a six-pack?' becomes 'abs' (short for abdominal muscles).
'will get drunk' is an anagram indicator.
'then'+'i'='theni'
'theni' with letters rearranged gives 'inthe'.
'abs'+'inthe'='ABSINTHE'
(Other definitions for absinthe that I've seen before include "Strong liquour in the basin?" , "Strong green alcoholic drink" , "French liqueur" , "Aniseed-flavoured liqueur" , "Green liqueur flavoured with wormwood and anise" .)