I have created a mini version of Clearwallet from the original sourcecode which should allow you to get your private key.
Let me know how it goes. I don't have a clearwallet account so cant fully test.
Use at your own risk. I didn't create or check the source code for anything suspicious.
Didn't work for me, doesn't show my Via address, looks like a bitcoin address ?
This should be fixed now if you want to try again. Looks like you have 2 options now.