Answer:

laugh

Answer	Crossword Clue
LAUGH	Gag reflex?
LAUGH	Get the joke
LAUGH	Respond to a riot?

LAUGH	Cackle or chuckle
LAUGH	React to funniness
LAUGH	Yuk it up
LAUGH	Joke response
LAUGH	Comedian's goal
LAUGH	Guffaw
LAUGH	Chuckle
LAUGH	Appreciate a joke

LAUGH	Amused reaction
LAUGH	Enjoy a joke
LAUGH	Comic's goal
LAUGH	Chuckle or guffaw
LAUGH	Giggle or chuckle
LAUGH	Crack up
LAUGH	React to a riot?
LAUGH	"..., clown, ...."

LAUGH	Pagliacci item.
LAUGH	Expression peculiar to the human species.
LAUGH	Something amusing.
LAUGH	Appear bright and gay.
LAUGH	Cachinnate.
LAUGH	Chortle.
LAUGH	Cause for merriment.
LAUGH	What a PArody might induce

LAUGH	Cachinnate
LAUGH	Respond to Steve Martin
LAUGH	Music to Jerry Lewis's ears
LAUGH	What a good joke elicits
LAUGH	React to Emmett Kelly
LAUGH	Har-de-har-har
LAUGH	Roll in the aisles
LAUGH	"... all you want ..."

LAUGH	"That's a ...!"
LAUGH	"Ho, ho, ho," e.g.
LAUGH	Twitter, e.g.
LAUGH	Be in stitches
LAUGH	Type of track