Possible Clues:

• Noted entertainer with a whistle
• The 'silent' Marx brother
• Silent star's leg severed by weapon
• Funnyman with a horn
• One of the Marxes
• Studio that made 'Precious'
• Silent film brother
• Silent brother of comedy
• He played Pinky in “Horse Feathers”
• Chat-show queen is looking up brother on big screen