Possible Clues:

• Rogue
• Rascal
• Unprincipled rogue
• Villain
• 'One might have a b---- rogue like this here, in a manner of speaking (9)'
• Knave
• Bounder
• Lillian Hellman had time for him
• Rogue to succeed in seduction, capturing German's and Italian's heart
• In good nick, chief constable detained relative of villain