Related Clues:

• Help with a heist
• Lend a sly hand
• Supporter of a cause
• Unite formally
• Encourage in wrongdoing
• Friendly party
• 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
• Aid partner
• Plane pioneer Cessna