Possible Clues:

• Novelist Caldwell
• Town on the River Clyde
• "Tobacco Road" author Caldwell
• 'Tobacco Road' author Caldwell
• Tollbridge across the River Clyde
• Author Caldwell
• 'Tobacco Road' novelist Caldwell
• -- Caldwell, author of 'God's Little Acre'
• Writer Caldwell
• Bowles of the Simpson-Bowles commission