Related Clues:

• (Maybe super)grass
• Tell tales up north to class as religious education put back
• One telling Times after this would make way back
• Like school pupil having little hesitation to be a sneak
• Old support for one new spy
• O'Flaherty's Irish grass
• Grass on firmer ground
• Criminal helping police, both now and earlier
• Mark, once of Take That
• Sneak attending lesson requires ruler
• Snow's tell-all chart single
• One snitching to police
• Popular ci-devant stoolie
• Grass all the rage in the past
• I can tell fin's damaged on sea-creature