Related Clues:

• A footnote about creeper
• A stop off to see something at the zoo
• Active species of snake
• Snake's adversary -- Saint Patrick, originally
• Nile Valley threat
• Ophidiophobe's fear, perhaps
• Ophidian menace
• Snake with a deadly bite
• Subject for a toxicologist
• Fanged Nile menace
• Nile swimmer
• Cobra kin
• Poisonous type dropping second article in without delay
• Slayer of Cleopatra
• "Raiders of the Lost Ark" threat