Any punture wound near a joint needs to be examined by a vet ASAP. There is very little barrier between the joint capsule and tendons/ligaments in these areas and the outside world. You said it's at a joint and is a deep puncture wound so it is very possible that it has affected one of those structures--most especially the joint itself. The clear fluid really has me worried because that is what you expect of joint fluid.
I would highly recommend that you get this wound examined by a vet this morning because an infection in the joint capsule or in tendon sheaths can be hard to clear up and have lifelong consequences. This is not something that you should be messing around with.