The phrase "magical nanny" refers to a person who is like a special and extraordinary guardian or caretaker, who has the ability to perform amazing and enchanting things. Full definition
The mysterious and magical Nanny McPhee (Emma Thompson) returns to her duties, this time to help Mrs. Green (Maggie Gyllenhaal) while her husband is away at war. (parentpreviews.com)
The Disney sequel stars Emily Blunt as the ageless magical nanny, Lin - Manuel Miranda as her buddy, and Meryl Streep as her cousin. (slashfilm.com)
Even magical nannies need to make a living wage. (allgeektome.net)