I've been using clementine as well. I would love the Music Plugin to recognize it. I downloaded your script and put it in /usr/share/amsn/plugins/music, restarted amsn but the clementine option is not showing up. I'm obviously missing something. What else do I need to configure/edit? Thanks for the script. I'm surprised the Music Plugin folks haven't yet included Clementine.
Edit: I looked at your script and noticed that you'd mis-spelled CLEMENTINE as CEMENTINE. I fixed the spelling, renamed the script to Amarok2, then used Amarok2. Working fine