Possible Clues:

• Talk tediously about old weapon
• Barb from Groucho's brother performing
• One's cast out at sea -- gets to talk endlessly about nothing
• Queequeg's weapon
• "Moby-Dick" weapon
• Whale-hunting spear
• Keep talking about old weapon
• Marx talking about object of whaling industry?
• Talk endlessly about old weapon
• Actor with no words to say, using spear