Possible Clues:

• Bug spray abbr.
• Target of a 1972 ban in the U.S.
• Outlawed pesticide: Abbr
• 'Silent Spring' subj.
• Sound of this in sect, a side (4)
• C14H9Cl5, familiarly
• How the deputy comes up with hundreds for the killer
• C14H9Cl5
• Bug killer, briefly
• It takes the poisonous hundreds to get the deputy back