I agree on the clutch fluid flush first. As far as bleeding it, it can be a complete pain in the ***.
Close the bleeder valve and pump away. You may have to do it 50 times or more. Make sure you keep the clutch fluid container topped off. Open bleeder valve. Repeat.
It took me about half an hour to get the fluid through the system.
But yeah, if this doesn't work, it'll be time to check out the CSC.