2010-11: Clark Bishop played for the St. John's bantam AAA team and skate for Team Newfoundland in the 2011 Canada Winter Games. He had 2 assists and 4 penalty minutes in six games at the Canada Winter Games.
2011-12: Bishop was the fourth-leading scorer for the St. John's Privateers midget AAA team as a 15-year-old. He scored 18 goals with 20 assists and had 45 penalty minutes in 23 regular season games. The Privateers won the Newfoundland Labrador league championship and lost to Moncton in the Atlantic Region championship game; just missing a trip to the 2012 Telus Cup. In eight playoff games Bishop scored 3 goals with 6 assists and had 10 penalty minutes. Bishop was selected by Cape Breton in the first round (3rd overall) of the 2012 QMJHL Entry Draft.
2012-13: Bishop skated for Cape Breton in his first QMJHL season and played for Canada Atlantic in the 2013 U17 World Hockey Challenge. He scored 8 goals with 14 assists in 58 games and was -30 with 33 penalty minutes. The Screaming Eagles had the QMJHL's worst record and were one of two teams to miss the playoffs. Bishop scored 3 goals with 2 assists and had 8 penalty minutes in five games for Canada Atlantic at the WHC.
2013-14: Bishop was named an assistant team captain for Cape Breton in his second season and skated for Canada in the 2013 Ivan Hlinka Memorial Tournament in August. He scored 1 goal and was +2 with 4 penalty minutes in five games as Canada captured a gold medal at the Ivan Hlinka tournament. Bishop was selected to play for Team Orr in the 2014 CHL/NHL Top Prospects Game.