Related Clues:

• Encourage in wrongdoing
• Drive the getaway car, maybe
• Harbor a fugitive
• Help surreptitiously
• Support, in a bad way
• Help make a no-no a go-go
• Aid in a crime
• Lend a sneaky hand
• Help a perp
• Partner in crime
• Partner of 5-Across
• Look out for?
• Further a felon
• Assist in illegality
• Lend a hand illegally