The crossword solution for the term HEAD IN THE BAR is FOAM, which is a four letter word. FOAM is a material that is made up of tiny bubbles of gas that are suspended in a liquid or solid. It is often used to make items such as mattresses, insulation, and fire extinguishers. In the context of a bar, FOAM is usually referring to the head of a beer, which is the layer of FOAM that forms on top of the beer when it is poured.