Possible Clues:

• "Arrowsmith" Pulitzer decliner Lewis
• Writer Upton
• Upton --, American novelist and social reformer (1878-1968)
• American novelist caught in crime den
• Sir Clive --, British inventor and entrepreneur
• Upton --, 1878-1968, US novelist
• Petroleum company with a dinosaur logo
• Upton __, author of The Jungle (1906)
• -- Lewis, winner of the 1930 Nobel Prize in Literature; author of the novel 'Main Street'
• Upton --, author of the books 'The Jungle' (1906) and 'The Brass Check' (1919)