one-trick pony

noun

1. informal.
   a person or thing considered as being limited to only one single talent, capability, quality, etc

Example Sentences

“I think being a one-trick pony is not the long game here,” Fishman says.

From The Daily Beast

But she also has to contend with photographers looking to exploit her as a one-trick pony to shock their audiences.

From The Daily Beast

Is he an underrated actor—which I, for one, believe he is—or a one-trick pony?

From The Daily Beast

To do so again would have rendered them a (very catchy) one-trick pony.

From The Daily Beast

As the indictment notes, Martoma was regarded by an SAC official as a “one-trick pony with Elan.”

From The Daily Beast