A shiner is an object that reflects light, and the following crossword solutions all relate to this concept. The first solution is 'SUN', which is a natural source of light that shines brightly in the sky. The second solution is 'MOUSE', which is an animal that has eyes that shine in the dark. The third solution is 'STAR', which is a celestial body that emits its own light. The fourth solution is 'LAMP', which is an artificial source of light that can be used to shine a beam of light. The fifth solution is 'BLACKEYE', which is a bruise caused by a blow to the face that can cause the eye to become swollen and shiny.