The term 'distillery vessel' can be summarized as a container used in the distillation process. The crossword solution for this term is 'VAT', which stands for Vessel for Alcoholic Treatment. This is a large, sealed container used to store and ferment alcoholic beverages such as whiskey, brandy, and rum. The vessel is usually made of stainless steel or copper and is designed to withstand high temperatures and pressures. The distillation process involves heating the liquid in the VAT and then collecting the vaporized alcohol that is produced. The vapor is then condensed and collected in a separate container.