Go for a Ringer is an idiom that means to try something difficult or risky in order to achieve a desired outcome. It is derived from the sport of horseshoes, where a ringer is a throw that lands around the stake and scores points. The term can be used to describe any situation where someone takes a risk in order to achieve a goal. In this crossword, the solution to the clue 'TOSS' is 'LOB, ' which is a type of throw.