Andrew -
You didn't mention what apps/environments you are cloning, but ...
Even with SnapManager and ProtectionManager there's no scheduled re-clone option that I've seen, just scheduled snap/vault/mirror.
SnapManager for Oracle will do remote cloning for you, including mounting the clone. There shouldn't be much scripting to it, you just need to schedule the job.
The other SnapManager products have like capabilities. You might want to take advantage of using those scheduled snaps for your clone.
Given that re-cloning off of a mirror is a very standard practice in Oracle and other environs, it would probably be a neat feature for the SnapManager folks to add to the family of products.
If you're not using SnapManager, then it's time to roll up your sleeves and script ...
I hope this response has been helpful to you.
At your service,
Eugene Kashpureff
NetAppU Instructor and Independent Consultant
(P.S. I appreciate points for helpful or correct answers.)