You'd want to set up an 802.1X SSID using EAP-PEAP.
Once your Active Directory servers are configured in ClearPass as an authentication source, you can use the "Aruba 802.1X Wireless" service template inside of ClearPass.
On the controller side, you'll need to put your ClearPass servers into a server group, then assign the server group the 802.1X server-group in the AAA profile for your 1X SSID.