The phrase "part wagon" refers to someone who is involved in or supports only some aspects of a particular cause, idea, or group, rather than fully embracing it. Full definition
It was part limo, part wagon, part minivan, part SUV. (autofocus.ca)
The 5 - Series Gran Turismo is a unique body style that is part wagon and part hatchback, with a somewhat taller seating position more like that of a utility vehicle. (cnet.com)
It was designed to be part sport sedan, part wagon and part SUV, but underneath, it's the same as the IS 300 sedan. (articles.orlandosentinel.com)