be a/the poor man's (someone or something)
To be an inferior substitute for the actual or genuine person or thing. That local artist is the poor man's Jackson Pollack—to everyone in town, at least. I was happy with my new car, even though my friends think it's just a poor man's Jaguar.
be a/the ˌpoor man’s ˈsb/ˈsth
be a person or thing that is similar to but of a lower quality than a particular famous person or thing: Try some of this sparkling white wine — the poor man’s champagne.