[1] He made his professional debut that season with the Gulf Coast League Yankees where he pitched to a 10.80 ERA in five innings.

[5] Clarkin was traded on July 18, 2017, along with Tyler Clippard and Blake Rutherford in exchange for Todd Frazier, David Robertson, and Tommy Kahnle.

[13] The White Sox designated Clarkin for assignment again on January 8, 2019, following the signing of Kelvin Herrera.

[23] On November 24, 2020, Clarkin signed a minor league contract with the Colorado Rockies organization.

[24] He split the 2021 season between the Double-A Hartford Yard Goats and the Triple-A Albuquerque Isotopes, struggling immensely to a 3-7 record and 7.86 ERA with 32 strikeouts in 68+2⁄3 innings pitched.

[9] On February 3, 2023, Clarkin signed a minor league contract with the Seattle Mariners organization after a year of inactivity.

[26] On April 18, 2023, Clarkin signed with the Long Island Ducks of the Atlantic League of Professional Baseball.

[27] In 16 starts for Long Island, Clarkin posted a 3–5 record and 5.56 ERA with 84 strikeouts across 79+1⁄3 innings of work.

On August 15, 2024, Clarkin signed with the Cleburne Railroaders of the American Association of Professional Baseball.