What does Leviticus 22:5 mean?

If a priest touches anything that could make him unclean, he can't eat the sacred food until he washes and the sun goes down. Then he's clean and can eat, since that's his share. Leviticus 22:5 - Modern Text Bible

(After washing and waiting until sunset, the priest is considered clean again and can eat the offerings, which are his rightful portion.)