The term 'BROTHER, of a sort' can be summarized by two crossword solutions: MONK (4 letters) and FRA (3 letters). A MONK is a member of a religious order who lives according to a specific set of rules and practices. Monks typically live in monasteries and devote their lives to prayer and service. FRA is an Italian title of respect for a man, similar to the English title of 'BROTHER'. It is often used to refer to members of certain religious orders, such as the Franciscan Order.