A winery plant is a facility that produces wine from grapes. The process of making wine involves harvesting the grapes, crushing them, fermenting the juice, and aging the wine in barrels or bottles. The term 'winery plant' refers to the physical structure where this process takes place. The crossword solution for the term 'winery plant' is 'VINE, ' which is a type of plant that produces grapes used in the production of wine.