Automotive clears are pretty clear. You can see the bottom of a quart or even a gallon can. Not like varnishes for wood that are tinted amber. The problems you'll face are
1. getting the clear to stick to your shade. What is it made of? Most clears are not designed to go onto a surface without a primer/paint base. A polyurethane like Imron will do the job, even on polished metal. Any clear ( like Diamond Clear from KBS Coatings) made for preserving aluminum, or mag wheels will stick, too.
2. getting a decent finish with a brush. Automotive clears aren't made to be put on like that, so they don't flow out as good as paints that are. There used to be a 'brushing additive' Dupont made for enamels like Centari, but I don't know if it's available any more, and if it will work with other type paints.
I think a wheel paint would be your best bet, as they are available in spray cans, as is Diamond Clear.