This bean may be transformed into a drink (8)
I believe the answer is:
absinthe
'a drink' is the definition.
(absinthe is a kind of drink)
'this bean may be transformed' is the wordplay.
'may be transformed' is an anagram indicator.
'this'+'bean'='thisbean'
'thisbean' with letters rearranged gives 'ABSINTHE'.
'into' is the link.
(Other definitions for absinthe that I've seen before include "alcohol" , "Potent aniseed-flavoured drink" , "Potent green gin-type liquor - wormwood" , "Liqueur - the basin (anag)" , "Green wormwood drink" .)