Your picture looks exactly like what happened to my car.
http://www.immigrant.la/w/P71200031.jpg
That is not a "clip", it is a tab/hole that receives a screw. You need to recreate the "hole".
It was on my passenger side.
I fixed it by doing this.
1.Crank the wheel all the way to the left, get under your car and remove the plastic connectors that attach the wheel well plastic to access the screw that should go through that broken tab.
2. Remove the screw that should go through that tab.
3. Pull the bumper out (like in the pic).
4. Push the tab back as close to original as possible.
5. Using some very strong (Gorilla brand) tape, fold it over the tab (Two pieces about 1.5 inches long).
6. Punch a little pilot hole in the tape.
7. Back under the car, in the wheel well, drive the screw back in. Piercing the tape, and into the original hole. If it is not lining up, remove the tape and try again.
8. Replace the wheel well plastic connectors.
Sorry, no pics.
Looks great, lasted a few months so far, I see no reason it will come undone again. Unless I drive onto something that rips it out (again).