Possible Clues:

• Popular clown at kids' parties
• Clown name
• ''The ___'' (Sellers film)
• 1950s-'60s Seattle zoo gorilla
• Film featuring Peter Sellers as a matador, with 'The'
• Acronym for today'syuppie?
• Sellers film, with "The"
• "The ___" (1967 Peter Sellers movie)
• Mr. Burns' teddy bear on "The Simpsons"
• Classic clown with a repetitive name