Possible Clues:

• Jack on "30 Rock"
• Obi-Wan Kenobi portrayer Guinness
• Billy Baldwin's brother
• 'Hick' actor Baldwin
• One of Stephen Baldwin's brothers
• The spy in 'The Spy Who Came In From the Cold'
• Guinness of "Smiley's People"
• Word after smart
• "The Black Stallion" boy
• He might make lace