Hi Graham,
I've tried your scenario, but still can't get the clipping result. It'll be best if you can send us example project where we can see it. If you want, you can open support ticket to send the project, or send us on private mail.
Thank you for your cooperation.
Greetings,
Miro Miroslavov
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Explore the
Telerik Public Issue Tracking
system and vote to affect the priority of the items.