The term 'DECIDES WHAT'S FAIR' can be represented by the crossword solution 'UMPS'. This is an acronym for 'umpires', which are officials in sports such as baseball and cricket who are responsible for making decisions on the field. Umpires are tasked with ensuring that the rules of the game are followed and that all players are treated fairly. They are also responsible for making calls on plays, such as whether a ball was fair or foul, and for resolving disputes between players. In short, umpires are responsible for deciding what's fair in a sporting event.