If you have another idevice and never played Coc on that other idevice then simply create a new game center account and play the game, complete the tutorial. Once completed, on your jailbroken device, simply log off your old game center account and log in with the new game center account. Make sure you force close the app before you do this. Then open the game and a pop up will ask you if you want load. It Okay and Confirm. Viola.
Not sure if you already figured it out by now but thought I just post it.