Under One's Wing Meaning

(idiomatic) Under one's protection, sponsorship, or tutelage.

Example:   He took the promising student under his wing.
  The promising student came under the professor's wing.
  He remained under the great man's wing after graduation.
  Now a professor himself he has young students under his wing.
March 15 2012, Soctt Tobias, The Kid With A Bike [Review]
  By happy accident, Cyril runs into Samantha (Cécile de France), a single hairdresser who takes him under her wing—first to help him find his missing bike and father, and later, on weekends away from the group home.