Clinical Research is a specific thing, and I'd say only a small minority (very small) have this sort of research experience. This relates to research dealing with patients, how they interact with drugs, clinical trials and outcomes of certain drugs, etc. I honestly don't know how AdComs view this. It is very rare, but usually your capacity is very limited as you don't have a medical license.
Most people have some sort of Basic Science Research. This means they are advancing the scientific knowledge of something. As for medical schools, they generally don't care if this is medically relevant because hypothesis building and testing is a skill you develop in this type of research. So whether you're investigating the infectious cycle of HIV or examining peapods like Mendel, they count for about the same. Basic Science research is what people refer to as "bench" research.
Sometimes people refer to Translational Research as Clinical Research, which is as the name describes, the translation of bench research into treating patients. This is also a very rare form of research since testing human subjects isn't done liberally.
