Cisco ISE allows you to create hierarchical Network Device Groups (NDGs) that contain network devices. NDGs logically group network devices based on various criteria such as geographic location, device type, and the relative place in the network (like "Access Layer" or "Data Center," for example).
Managing Network Device Groups
http://www.cisco.com/c/en/us/td/docs/security/ise/1-2/user_guide/ise_user_guide/ise_man_network_devices.html
Once you are done with that you can create a rules under policy elements based on device location. In your case it would be a WLC. Remember, it would be location of the network access device and not the end client. If condition matches you will get the desired results.
Hope it helps.
Regards,
Jatin Katyal
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~Jatin