The term 'Sentence Finisher' refers to a person who is responsible for completing sentences in a legal context. The three crossword solutions for this term are CON (3 letters), EXCON (5 letters), and INMATE (6 letters). CON stands for convict, which is a person who has been found guilty of a crime and sentenced to a period of incarceration. EXCON is an abbreviation for ex-convict, which is a person who has served their sentence and been released from prison. INMATE is a term used to describe someone who is currently serving a prison sentence.