No, cloning a vCenter won't work. It's not as simple as a Linux template or something similar. It will need to be deployed fresh with unique settings (and a license).
make a backup of "VCSA" from "VAMI" ... and restore the backup to a new installation. purchase the vmware license
I dont see a problem of the "cloning" which is basically the same as a VM backup/restore.
The problems starting after the cloning (copying):
- Changing Hostname in VCSA 6.5 is not supportet
- If you use an IP as hostname it is even not allowed to change the IP Address. These problems are solved with 6.7u3
- You have to change the vCenter ID otherwise Mr. Murphy may will create new VMs with same MAC
- You have to recreate all the certs
- You have to leave AD prior or not use AD with the clone VCSA. Dont know if LDAP based AD connect is better
For sure you need a new license of course.