I usually think of an instructor as someone who unpacks things, such as unpacking the meaning of an obscure word or explaining a difficult concept.
Last night I was trying to read some unbearably dry medical/legal material and thought about how an instructor might also pack things, wrapping dry material in some sort of story or illustration to make it more palatable.
I’ve often thought it would be nice to have someone explain this or that. I hadn’t really thought before that it would be nice to have someone make perfectly clear material more bearable to absorb, but I suppose that’s what a lot of instructors do. I was able to avoid courses that needed such an instructor, for which I am grateful, but I could imagine how a good instructor might make a memorization-based course tolerable.