The crossword solution for the term SEPT is CLAN, which is a four-letter word. A CLAN is a group of people united by a common ancestor, or a group of people who share a common interest or purpose. Clans are often associated with a particular geographic area, and members of a CLAN typically have a strong sense of identity and loyalty to one another. Clans can also refer to extended families, or groups of people who are related by blood or marriage.