Possible Clues:

• See 8 Across
• Clarence of the Supreme Court
• Sir - More, sixteenth century English statesman
• St. - - More, author of Utopia
• Biblical doubter
• More perhaps wrestling with maths - but there's nothing in it
• Menlo Park first name
• Poet such as Arnold or Hood
• Author of a play for voices, sceptical type
• Ma shot the man