The term 'Schooner Filler' refers to a person who is responsible for filling schooners with BEER. The three solutions to the crossword are ALE, LAGER, and BEER. ALE is a type of BEER that is brewed using warm fermentation with top-fermenting yeast. LAGER is a type of BEER that is brewed using cold fermentation with bottom-fermenting yeast. BEER is an alcoholic beverage made from fermented grains such as barley, wheat, and rye.