You can't really just re-clear over the peeling clear... Well you can, but you will see clear outlines of where the peeling was and the colors will most likely be a good bit different (where there is still existing clear vs no clear. You can try to get the paint matched in a single stage like mentioned above, but if it is a metallic paint, be prepared for it to still look different. Either of those methods will work to make it shiny, just won't look quite right.
The best results for a simple/at home job would be to get some clear (Southern poly is good, Nason or shopline would be sufficient and half the cost) 2 qts spray-able should do your hood, roof and deck lid. The amount of peeling spots will determine the amount of base coat, but go to your local paint supplier, have them take a photo of your cars paint and mix up a pint or quart of base coat to match. Get your reducer, thinner, clear, papers. Feather out the edges of the peeling areas to smooth them out and sand the panels with 600 on a DA, and lightly blend the areas with the base coat (shoot out over the feathered edges about 4-6"), but try to keep the base coat away from the edges of the panels so the edges of the hood/roof/trunk will still be original base and match the fenders and quarters. Then 2 coats of clear over the entire panels and you should be good. You will see light depressions where the clear was missing, but this way you won't see the edges of the old clear. If you want it better you can also shoot some primer over those spots before base coat, then sand that down and base it so you don't have the depressions where the clear was missing.