Short arm action is defined by elbow extension of less than 120 degrees at hand separation, and long arm action is anything greater than 120 degrees of elbow extension at hand separation...
https://tyleranzmann.com/fitness/short-and-long-arm-action-examined/#:~:text=Short%20arm%20action%20is%20defined,elbow%20extension%20at%20hand%20separation.
Fun Fact: Last season the Jays had a 2nd best wRC+ of 112 in the MLB, this season they have a wRC+ of 105... no need to panic man, it's May the 4th be with you.
Clevinger was looking good through 4 innings, than kind of hit a wall here in the 5th. Padres should be happy with his first appearance back from Tommy John.