The term 'Alcohol Measure' can be broken down into two crossword solutions: 'Fifth' and 'PROOF'. A fifth is a unit of measurement for alcoholic beverages, equal to one-fifth of a gallon or 750 milliliters. It is commonly used to measure distilled spirits such as whiskey, vodka, and gin. PROOF is a measure of the alcohol content of a beverage, expressed as twice the percentage of alcohol by volume. For example, a beverage with an alcohol content of 40% would be 80 PROOF.