* Someone who works at a school: This is the most likely meaning. It could be a teacher, administrator, janitor, librarian, or any other staff member.
* Someone who is heavily involved in school activities: This could be a student who is highly engaged, a parent who volunteers frequently, or a community member who supports the school.
* Someone who has a personality or demeanor associated with schools: This is a more subjective interpretation. It might refer to someone who is organized, methodical, or follows rules strictly, characteristics often associated with school environments.
To understand the meaning, you need to consider the context in which the phrase is used.