The term 'well-versed' can be defined by the crossword solutions of ADEPT (5 letters), INFORMED (8 letters), FLUENT (6 letters), EXPERIENCED (11 letters), ERUDITE (7 letters), and UPON (4 letters). ADEPT means having or showing knowledge, skill, or proficiency in a particular area. INFORMED means having knowledge or information about something. FLUENT means able to express oneself easily and articulately. EXPERIENCED means having had experience in a particular field or activity. ERUDITE means having or showing great knowledge or learning. UPON means at or in an earlier time or period. Together, these words describe someone who is knowledgeable, articulate, EXPERIENCED, and learned in a particular area.