The crossword solution for the term 'EWER's Partner' is 'BASIN'. A BASIN is a type of bowl-shaped container used for holding water or other liquids. It is often used in bathrooms and kitchens, and is usually made of ceramic, metal, or plastic. In the past, basins were also used for washing clothes and dishes. The term 'EWER's Partner' refers to the fact that a BASIN is often paired with an EWER, which is a large jug-like vessel used for pouring liquids.