Possible Clues:

• Ominous request from a teacher
• "We need to talk"
• "If they could ___ now ..."
• Words written by a teacher on a failed test, perhaps
• Dreaded message on a returned 32-Down
• Terse written summons
• Note below F, perhaps?
• Teacher's note that makes one go [gulp]
• Words next to a bad grade, perhaps
• Worrisome note to get from a boss