Alcoholic drink cures heart failure (10)
I believe the answer is:
'alcoholic drink' is the definition.
(Chartreuse is a type of liqueur)
'cures heart failure' is the wordplay.
'failure' indicates anagramming the letters.
'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" .)