Church treasure turned into alcohol (10)
I believe the answer is:
chartreuse
'alcohol' is the definition.
(Chartreuse is a type of liqueur)
'church treasure turned' is the wordplay.
'church' becomes 'ch' (abbreviation on maps etc).
'turned' indicates anagramming the letters.
'treasure' with letters rearranged gives 'artreuse'.
'ch'+'artreuse'='CHARTREUSE'
'into' is the link.
(Other definitions for chartreuse that I've seen before include "Pale green-yellow colour" , "Carthusian liqueur" , "Green or yellow liqueur made by monks" , "drink" , "Green-yellow liqueur" .)