sometimes you get a shit can of clear... I had that exact same issue repainting a set of wheels for my car... it basically ruined a few days of work, I had to sand back down to metal and reprime, repaint and re clear.
shake it well.... and when you think you've shaken it enough, let it sit a minute and shake it more.
Also, test the quality of the clear, so prep a scrap piece of anything, similar material to what you're actually painting would be better. prep and paint it exactly the same method of your final piece, and apply the same clear as you would the final piece after paint has had time to dry.
You'll know if you have a shit can or not. At least it's easy to sand and blend a portion back in... if you were using metallic flake or pearl paints.. good luck blending.