Champion almost entirely consuming a drink (8)
I believe the answer is:
advocaat
'a drink' is the definition.
(alcoholic drink)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for advocaat that I've seen before include "Liqueur (for lawyers?)" , "Booze" , "Liquer of eggs, sugar and brandy" , "Liqueur containing raw eggs" , "Liqueur made from eggs, sugar and brandy" .)