More than likely, your clock problem is a "fuse" that has burned out in the clock. If you have a soldering iron and know how to use it, it is any easy fix and the cost should be under $5. There is an article by James Mahaffey on the MBCA.org forum that describes how to fix it. Hopefully you can access this forum but you might have to be an MBCA member to do that. If you can, go to MBCA.org. Then click on "Forums" under Community at the top of the page. Then search of VDO. Go to post "VDO Clock Question For W108/109" and at the thrid reply by Jon Agne, click on "Clock Repair 1" and "Clock Repair 2" to see the article and the pictures associated with it.
Mr. Mahaffey calls out for a certain diode but most any small diode will work. Most on-line places want to sell you packs of 10, 20 or more of the parts involved. Since Radio Shack is not around now, ask one of you electronics friends for where too buy them.
I fixed mine a few years ago using this method and it is still working.
If you have trouble accessing the article, give me a PM and I will try to copy and send to you.