The term INSTALL AS PRIEST can be summarized by the crossword solution ORDAIN, which is a six-letter word. To ORDAIN someone is to formally install them into a position of religious authority, such as a priest. This process is often done through a ceremony or ritual, and is usually performed by a higher religious authority. Ordination is an important part of many religions, and is seen as a way to recognize and honor those who have been chosen to serve in a spiritual capacity.