The term 'SHEPHERD's Staff' is a reference to a tool used by shepherds. It is also known as a CROOK, which is a five-letter word that can be used to solve the crossword. The staff is a long stick with a curved end, which is used to help guide and protect sheep. It is also used to hook branches and pull them down for the sheep to eat. The staff is an important tool for shepherds, as it helps them to keep their flock safe and healthy.