Trick is to keep offering it up until it closes as tightly as possible, then try and work out how to hold it there. More than once I have resorted to covering a piece of wood in cling film, then using car body filler to make a lump of material that fits it exactly and can then be shaped so the clamp can work as required. All good fun.
I agree with Spanner 48 on the use of Araldite in general.
Only thing to consider here is it does set to a darkish colour, so might not be suitable for your light wood.
But you do want something that doesn't go off too quickly, so you have time to make small adjustments. I find Gorilla glue is pretty good.