Related Clues:

• Help do wrong
• Aid a crook
• Go undercover
• Give a yegg a leg up
• Help on the sly
• Assist, as a bad guy
• Aid in a scam
• Assist to do wrong
• Case the joint, say
• Help slyly
• Get hush money from, for instance
• Aid and assist
• Help illicitly
• Further feloniously
• Incite or encourage