As an amateur he is a six-time Canadian national champion and represented Canada at 2 commonwealth games and the 2012 Olympics, where he reached the quarter-finals.
Clayton began training at his great-uncle's gym, City of Lakes Boxing Club in Dartmouth, Nova Scotia, and fought his first amateur bout at the age of 11.
[4] At the 2012 Summer Olympics (results) Clayton became the first Canadian to win a boxing bout in 8 years when he beat Óscar Molina in the opening round.
His first professional fight took place on December 19, 2014 at division light middleweight in gala undercard featuring Adonis Stevenson in Quebec City.
[7] On 28 January 2020, Clayton scored an eighth-round knockout of Diego (El Chacarero) Ramirez and retain his WBA title.