Clarke was non-tendered by the Diamondbacks on Tuesday, Nick Piecoro of The Arizona Republic reports.
Clarke appeared in 43 games as a reliever during 2021 and had a 4.98 ERA, 1.52 WHIP and 39:14 K:BB across 43.1 innings. He may need to settle for a minor-league deal to receive a chance in spring training in 2022.