The term 'Guinness Product' is a reference to the popular Irish beer, Guinness. The crossword solution for this term is ALE, which is a type of beer that is brewed using a warm fermentation method and top-fermenting yeast. ALE has a higher alcohol content than lager and is usually darker in color. Guinness is an iconic brand of ALE that has been brewed since 1759 and is known for its distinctive flavor and dark color.