A leading candidate for NBA Sixth Man of the Year already, Clarkson knows his role is to score - and there aren't many shots he'll turn down.
Simmons scored eight straight points in the fourth quarter to cut the Jazz lead to 110-104 with 8:40 left.
Embiid was scratched after coming out to warm up, and coach Doc Rivers expressed surprise the big man wasn't playing.
The Jazz scored 10 consecutive points as part of an 18-4 run to take their first lead in the second quarter and went up 67-59 on Bojan Bogdanovic's jumper in the lane.
Simmons and Harris took turns isolating and driving to the basket with a full head of stream starting from beyond the 3-point line.
Clarkson joined Jeff Hornacek, Rodney Hood, Randy Foye and Bogdanovic as Utah players to hit eight 3s in a game.
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