Answer:

LATEPASS

Answer	Crossword Clue
LATEPASS	A doctor's note might get you one
LATEPASS	Holdup note?
LATEPASS	Note excusing tardiness

LATEPASS	Note used for a holdup
LATEPASS	Slip for a tardy student
LATEPASS	Tardy student's need
LATEPASS	Hall monitor's bestowal
LATEPASS	Delayed student's note
LATEPASS	Gym entrance requirement, sometimes
LATEPASS	Student excuser
LATEPASS	Excuse for a teacher

LATEPASS	School paper a student shouldn't write himself
LATEPASS	It might allow a student to avoid detention
LATEPASS	School allowance?
LATEPASS	Tardiness excuse