A Radical Centrist combines aspects of the dissident left and dissident right. They primarily anti-establishment rather than ideologues. They may support conservative positions such as immigration restrictions but may align with the left on non-interventionism, protecting entitlements, and regulating Wall Street. They tend to be moderate or ambivilent on social issues such as abortion and gay marriage.
Actually, that might be a good description. Though, considering I have heard people say the LibDems are radical centrist, Nick Clegg and Donald Trump are definitely not in the same category.