Possible Clues:

• 'Cauliflower is nothing but cabbage with a college education' writer
• Mark ___ , American writer
• Clemens pseudonym
• 'Climate is what we expect, weather is what we get' author
• "Climate is what we expect, weather is what we get" author
• Mark in literature, and two in history
• A humorous writer or two
• American author - two
• Clemens handle
• 'Huckleberry Finn' author