Hmmm Well, short of taking him to the vet to see if he needs stitches, I guess if you’re wanting to take care of things at home I’d suggest cleaning with hydrogen peroxide, covering with neosporin and putting a wrap on it. However, I don’t know how far up the leg it is cut. You can’t just put a wrap up high. It has to be wrapped all the way down to the toes or the leg could swell up below it. Do not take this as any official vet recommendations, as I’m no expert. Of course, going to the vet is always best. But if it isn’t that big of a chunk missing, you might be OK with cleaning and watching it for any signs of infection…oozing, pus, redness. There’s bound to be a bit of redness. Also bare in mind that if it does need stitches but you end up waiting several days, they probably will not be able to then stitch it after that long.
Kinda wondering why you were clipping them and how old they were and such. I’m sure you’re feeling bad enough about this and I’m not perfect, so I’m not commenting on that. But we have other angora owners who may have helpful insight about grooming.