I don't think you will find much out there about clapping and waving. Individually, they are not really milestones.
Joint attention skills, i.e. back and forth gestures, pointing, waving, clapping, those early building blocks to verbal communication, begin to emerge at 9 months. Only after 12 months should there be any concern if the child has none of these skills. And, if my child was already on par as far as verbal skills, I would only be mildly concerned.
If a child does not clap because they cannot coordinate their two little hands together this is a sign of a dysfunction of bilateral integration. If this was the issue they might not also be able to bang two objects together at the body's midline.
My DD would point at things and raise her hands in the air (when asked) at 9 months, point out almost any body part we could come up with by 12 months, but did not really wave until much later. She still doesn't like to wave. I don't think she clapped until 13 months.
She speaks in complete 10+ word sentences now (22 months), and I still worry.