be under the wing of (someone)

To be protected, tutored, nurtured, or cared for by someone. I was really nervous starting my master's degree, but I was lucky enough to be under the wing of one of the top professors in the university. Our parents died when we were quite young, so my sister and I were under the wing of our grandmother for most of our lives. I can't believe the new guy's already under the wing of the CEO! She still doesn't know who I am, and I've been here two years!