Answer: shadowboxer

AnswerCrossword Clue
SHADOWBOXERTail the junior senator from California?
SHADOWBOXERPhantom fighter
SHADOWBOXERPerson training for a bout
SHADOWBOXERPugilist in training
SHADOWBOXERPugilist in training, perhaps
SHADOWBOXERAir-punching pugilist