The term 'catbird seats' is a phrase that originated in the United States and is used to describe a situation of great advantage or superiority. It comes from a short story by James Thurber, in which a catbird sits in a tree and mocks the other birds. The crossword solution for this term is 'ROOSTS', which is a place where birds rest or sleep. ROOSTS are typically found in trees, which is why the phrase 'catbird seats' is used to describe a situation of great advantage.