The term 'Wine Improver' refers to a person who specializes in improving the quality of wine. The crossword solutions for this term are AGE, which is an abbreviation for the process of aging wine. Aging wine is a process that involves storing the wine in a cool, dark place for a period of time, allowing it to develop more complex flavors and aromas. This process can improve the overall quality of the wine, making it more enjoyable to drink.