Related Clues:

• Mental sharpness
• S.J. Perelman, for one
• Twain's talent
• Witty sort
• Humorous one
• He does a stand-up job
• Joker who often elicits groans
• Comic character
• Laugh provider
• Professional joke teller
• ___ and wisdom
• Groan inducer?
• Witty type
• Good humor man?
• Mental acuity