Possible Clues:

• Banned organochlorine
• Bossed around
• Toxin mentioned in Joni Mitchell’s “Big Yellow Taxi”
• Substance whose primary use earned its discoverer the 1948 Nobel Prize in Physiology - but is now banned
• 'Silent Spring' subject, for short
• Insecticide whose 1972 ban led to the comeback of the bald eagle
• One of the Stockholm Convention's ''dirty dozen''
• What Carson warned about
• Rachel Carson concern
• What Rachel Carson wanted banned