Download an illustrated parts list for your scooter and look through it for anything that resembles that little green thing.
Does your scooter have any green parts on it, that is an unusual color for a clip of some sort.
Yep, it's the "nut" side of a fastener often used to hold plastic body parts on. Look for a hole where a screw should be. Sometimes these drop during assembly so another one is used but check everything closely. It's expensive replacing some body panels.