If it is only the leading edge and not the saddle or the spar or ribs of the wing, it should be an easy fix. How damaged is it and how bad is the tip? Is there any broken ribs? You can pull back the covering a little past the damaged area and see what you are up against. If any of the leading edge is intact, try to leave it and square it off for a new piece. Take a piece of balsa a little larger than the damaged area and cut, shape and sand it to fit. I would then epoxy it into place as you cannot be sure the CA would reach everything. Once done check the fit in the saddle and adjust accordingly. Cover the area and go try to land safely again. If possible, make sure a more experienced modeler is at your field when you are ready to fly it, explain to him how you fixed it and let him help you decide if it is flight worthy. [8D]

Good Luck,
Bob