Leading the League is a phrase used to describe a team or individual that is at the top of their respective league. In this case, the crossword solutions for the term are FIRST and ONTOP. FIRST is an adjective meaning being before all others in time, order, rank, or importance. ONTOP is an adverb meaning in or into a position above or higher than something else. Together, these two words can be used to describe a team or individual that is at the top of their respective league.