You can check their FAQ on their site. Only way that comes to mind would be to set up the game with your normal Google play store login then change the Google login on your device and see if it will let you link it to g+.
Hey guys, I was interested in knowing if anybody on XDA is an avid clash of clans player. I ask this because I am looking to form a clan for all of us XDAers. If you are interested in this idea, please leave a reply and we'll get something going.
Thanks
Edit: The clan I created a day ago is called MA Bears. Leave your clash names when replying so I know who you are