Possible Clues:

• “The Country Girl” playwright
• ''Awake and Sing!'' playwright
• American playwright
• Clifford who co-wrote 'Sweet Smell of Success'
• Sweet Smell of Success screenwriter
• Author of "Golden Boy" and "The Country Girl"
• 'Waiting for Lefty' writer
• Clifford ___, 'Awake and Sing!' dramatist
• 'Golden Boy' writer
• 'Awake and Sing!' dramatist