Undead Fortitude. If damage reduces the Zombie Clown to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the zombie drops to 1 hit point instead.

Hideous Laughter. At the start of the Zombie Clown's turn, every living creature within 60 ft must succeed on a DC14 wisdom saving throw or take 2d6 psychic damage

Slam. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 4 (2d6 + 2) bludgeoning damage.

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 4 (2d6 + 2) piercing damage. 3 (1d6) poison damage.