Is an accomplice to

• Plans a getaway for, maybe
• Helps along
• Drives a getaway car for, e.g.
• Hides evidence, e.g
• Provides a false alibi for
• Urges on
• Lends a sneaky hand
• Is the getaway driver for, e.g
• Acts as accomplice

Wiktionary Word definitions in Wiktionary
vb. (en-third-person singular of: abet )