What you have there is called orange peel.
This occurs if the paint gun/spray can is held too far away from the surface to be painted.
When this happens, the carrier in the paint/clear coat flashes off on it’s way to the surface. So instead of the paint/clear coat flowing together to create a smooth surface you get this orange peel effect.
You can try wet sanding the surface smooth starting out with 1000 grit sandpaper, and then go to 1500 grit, and then to 2000 grit.
Then buff the surface.
Tester