Coulrophobia

Coulrophobia explained.
And the etymology:

A neologism, coined in the late 1980s or 1990s. Supposedly based on Ancient Greek κωλοβαθριστής ‎(kōlobathristḗs, “one who goes on stilts”) (from κωλόβαθρον ‎(kōlóbathron, “stilt”), from κῶλον ‎(kôlon, “limb”) + βαίνω ‎(baínō, “I go”), chosen for lack of an obvious Ancient Greek equivalent of "clown", combined with the -phobia ‎(“fear of”) suffix.