1) Admirer 2) Booster 3) Champion 4) Court entertainer 5) Exclusively Anglo word 6) Exclusively Saxon word 7) Friend 8) Number-one single in Austria 9) Number-one single in Scotland 10) Pep rally performer 11) Protagonist 12) Sideline rooter 13) Sideline sight 14) Split personality 15) Supporter 16) Ultra Music single 
[n] - someone who leads the cheers by spectators at a sporting event
noun someone who leads the cheers by spectators at a sporting event
a person who leads spectators in traditional or formal cheering, esp. at a pep rally or athletic event.