I'm trying to create a flat plane icon of a clock that can start full and over the course of time have it's outer edge swing 360 degrees around it's center point and then terminate when it's gotten back to it's starting point. An example would be this image of a clock but with just the green portion visible: http://cdn.vectorstock.com/i/composite/93,19/time-steps-icon-vector-749319.jpg
I really just started using Blender last week so I feel like I'm pretty in over my head. What I've seen so far suggest that Shape Keys could be a solution, but I'm not sure how to get a flat shape to link to a circle. An array modifier could also be a solution, but I'm not sure it'll work on a solid object.
Does anyone have a solution to this?