Related Clues:

• Venom, e.g.
• Murder method in Christie's 'A Pocket Full of Rye'
• Harmful agent
• Arsenic, for one
• Weapon alternative in mysteries
• Whodunit staple
• If taken, it can harm or kill
• I spoon up the lethal substance
• Toxin
• Toxin or venom
• Poison, venom
• Venom, harmful substance
• Venom, toxin
• It causes illness or death in a living organism
• The last thing you'd take is one of this in a spoon