The crossword solution for the term 'FUSS AT THE MIRROR' is 'PREEN'. Preening is a behavior in which an animal cleans, grooms, and arranges its feathers, fur, or other parts of its body. It is usually done to maintain hygiene and improve appearance. Preening is also used as a form of communication between animals, and is often seen in birds and mammals. In humans, preening is a form of self-care, such as styling hair or applying makeup.