Related Clues:

• Pen pal's comment?
• Porcine sound
• Word from a pen pal?
• Word from the pen?
• Babe's greeting?
• Comment from the pen
• Hoggish comment
• Pigpen plaint
• Porcine protest
• Sign of a pen problem?
• Barnyard cry
• Chester White remark
• Sound on a 58-Across, perhaps
• Sheep trills
• Pen pal's protest?