This (color corrected) screenshot is from the gtk-clutter-test application that is included with clutter-gtk. In order to run this i had to:

• port and package clutter-gtk (since it's not part of fremantle which is rather odd since these are the gtk bindings for clutter)
• hildonize the gtk part of the test app
• no changes in the clutter part were required

The entire process took less than half an hour. But there are artifacts around the bitmaps and the frame rate is very low. So, yes, you can run clutter via scratchbox, but it's not very useful yet (at least on my machine, but perhaps i am just suffering from the performance problems you also experience).