Bucks Fizz destroyed Maoism (6)
I believe the answer is:
mimosa
'bucks fizz' is the definition.
(both can mean a champagne and orange juice drink)
'destroyed maoism' is the wordplay.
'destroyed' is an anagram indicator.
'maoism' anagrammed gives 'MIMOSA'.
(Other definitions for mimosa that I've seen before include "So maim with tropical shrub bearing fragrant flowers" , "Variety of acacia" , "Australian acacia tree" , "Plant genus popularly extended to the Acacia" , "Buck's Fizz" .)