How can this be done with the relationship, and is it worth it? (Get all departments for clinic)

I have 3 tables:

clinics

departments

clinics_in_departments

$department = ClinicsInDepartment::whereIn('clinic_id',[1,2,3])
            ->join('departments', 'clinics_in_departments.clinic_id', '=', 'department.id')
            ->get();

How can this be done with the relationship, and is it worth it?

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