Answer: jumpsthegun

AnswerCrossword Clue
JUMPSTHEGUNStarts ahead of time
JUMPSTHEGUNStarts prematurely.
JUMPSTHEGUNGets a head start
JUMPSTHEGUNStarts too early
JUMPSTHEGUNWhat the cheating sprinter does?