The best way to get off excess glue is to do it before you put the fletch on the shaft.

Take your bottle and squirt a bead along the base of the fletch while it is in the clamp.
Then take the clamp and dab the base of the fletch on a paper towel. This will spread the glue out evenly and remove all of the excess. When you put the fletch on the shaft, you get just a tiny bead that oozes out from under the base and ensures good adhesion.