ALE HEAD is a term used to describe the FOAM that forms on top of a beer when it is poured. It is made up of proteins, lipids, and carbohydrates that are released from the malt during the brewing process. The crossword solution for ALE HEAD is FOAM, which is an acronym for 'FOAM On A Malt Extract'. This FOAM is an important part of the beer drinking experience, as it helps to enhance the flavor and aroma of the beer.