The term 'ROUNDUP CRITTER' is a five-letter word that can be solved by the crossword clue 'STEER'. A STEER is a castrated male bovine, typically kept as livestock. It is also used to refer to a person who guides or directs others. In this context, the term 'ROUNDUP CRITTER' refers to a STEER that is used in a roundup, which is an event where cattle are gathered together for branding, sorting, or other management purposes.