The term 'Home Ruler' is a reference to the Irish political movement of the same name, which was active in the late 19th and early 20th centuries. The Home Rule movement sought to establish an independent Irish state, free from British rule. The crossword solution for this term is 'UMPIRE, ' which is a person who makes impartial decisions or judgments in a dispute or competition. An UMPIRE is often seen as a neutral party, making decisions based on fairness and justice.