Possible Clues:

• Rogue artist's beginning to collude with gangster
• Untrustworthy one
• Bounder
• Mischievous type, Oriental sailor switching directions
• Monkey centre in Miami getting through Carl's bananas
• Bad lot included in Cleopatra's calculations by Haggard
• Ultimate in misbehaviour when class briefly admits a naughty child
• Wily sort
• Mischievous or cheeky person
• Asian sailor switching sides, first and last, is such a scoundrel