Possible Clues:

• Fearsome snake
• Mother holding black serpent
• Deadly 23-Across kin
• Cobra relative of Africa
• Baby initially nursed by two parents, one with fangs
• Sub-Saharan predator
• Snake dance from Brazil with a different beginning
• Harm dodged by one sailor that's turned up a snake
• Speedy serpent
• Its bite delivers powerful neurotoxins