The term 'INGREDIENT IN A BLACK AND TAN' is a reference to a popular mixed drink made with two types of beer. The crossword solutions for this term are ALE (3 letters) and LAGER (5 letters). ALE is a type of beer that is brewed using warm fermentation, while LAGER is a type of beer that is brewed using cold fermentation. Both ALE and LAGER are commonly used as ingredients in a Black and Tan, a popular mixed drink made by combining equal parts of ALE and LAGER.