Champagne cocktail (6)
I believe the answer is:
mimosa
'champagne cocktail' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for mimosa that I've seen before include "Sensitive thing growing" , "Sensitive plant genus; so maim (anag.)" , "Type of acacia tree" , "Australian acacia tree" , "cocktail" .)