Comic relief

You may be looking for the charity.

When Teddy Baxter's career was in decline, after the loss of his double act partner, he was reduced to providing comic relief in low-calibre films, at his own estimation. (AUDIO: The Vardan Invasion of Mirth)

Missy identified Nardole as comic relief to Bill Potts' exposition, clarifying to the former that was she referring to them as genders rather than functions. (TV: World Enough and Time)