The Collaborative International Dictionary
Clownage
Clownage \Clown"age\, n.
Behavior or manners of a clown; clownery. [Obs.]
--B. Jonson.
Douglas Harper's Etymology Dictionary
clownage
"function or manners of a clown or jester," 1580s, from clown (n.) + -age.
Wiktionary
clownage
n. (context obsolete English) The behaviour or manners of a clown; clownery.