Have you tried newer CLEAR software?
My CLEAR adapter USBw 25100 (firmware version 5.2.2061039) works with Snow Leopard (10.6.1) on my MacBook, running CLEAR Connnection Manager version 1.03.1031.0.
I originally installed the software from
http://www.clear.com/support/download (version 1.03.0082.0, created October 2, 2009). Then I was able to run the CLEAR Connection Manager, select Tools > Check for Application Updates Now, and obtain a newer version 1.03.1031.0.
I do not know why they won't post the newer update to the downloads web page.