Alcoholic drink cures heart failure (10)
I believe the answer is:
chartreuse
'alcoholic drink' is the definition.
(Chartreuse is a type of liqueur)
'cures heart failure' is the wordplay.
'failure' indicates anagramming the letters.
'cures'+'heart'='curesheart'
'curesheart' is an anagram of 'CHARTREUSE'.
(Other definitions for chartreuse that I've seen before include "Carthusian liqueur" , "drink" , "The spirit" , "Green or yellow liqueur made by monks" , "green liquid" .)