The term 'Vessels for Vintners' refers to large containers used to store and age wine. The crossword solution for this term is 'Tuns, ' which is a four-letter word that describes a large barrel or cask used to store wine. Tuns are typically made of wood, such as oak, and can hold up to several hundred gallons of wine. They are often used by vintners to age their wines, allowing the flavors to develop and mature over time.