Possible Clues:

• Idiot in school who tells on his classsmate?
• Two-legged squealer
• Teller of tales is trouble for the head in school
• Ultimately cuts down long grass
• Sons evenly cut long grass
• Betray (informal)
• Whistle-blower
• Fool in school to tell tales
• Tin on top of long grass
• Poles must have urge to squeal