A posse member is a person who is part of a group of people organized to enforce the law, usually in the absence of regular law enforcement. The four crossword solutions for the term POSSE MEMBER are SEEKER (6 letters), PURSUER (7 letters), CHASER (6 letters), and DEPUTY (6 letters). A SEEKER is someone who searches for something, while a PURSUER is someone who follows or chases after something. A CHASER is someone who actively pursues something, and a DEPUTY is someone who is appointed to act as a substitute for another.