The term 'Brewing Measure' can be summarized by the crossword solution 'Firkin, ' which is a six-letter word. A firkin is a unit of measurement used in brewing, equal to one quarter of a barrel or nine imperial gallons. It is also used to refer to a small wooden cask or keg, usually made of oak, that holds this amount of liquid. Firkins are commonly used to store and transport beer, cider, and other alcoholic beverages.