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If it's the C-clip in the diff it should be obvious -- look where the shaft meets the diff, and see if there's movement between the CV joint and the diff casing. If you can pry the CV joint away from the diff easily than the clip is missing or broken. I think it's more likely one of your CV joints has broken internally, or has severe wear. Possibly grit got in there after the boot split and resulted in accelerated wear.
I would either get a new/rebuilt shaft, or find a good used one and re-boot it.
The shaft replacement itself is a messy job but not too difficult of one. The hardest part for me was getting that cussed circlip back in place. I went through my whole stock of dirty words within the first ten minutes and had nothing left for the next 50. Get the car up securely in the air and make it as comfortable as possible for yourself under there, because you're going to be there a while.
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