The Clay node will act just like Diffuse until you increase the Roughness.

Be sure to turn off the built-in diffuse ... set Diffuse_Value on the root node to 0.

Clay has little to no specular, so set Specular_Value = 0.

If you are simulating a somewhat polished clay, you will need some very broad and weak specular. If you are doing glazed clay, this is all wrong and you need one of my glass shaders.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)