Related Clues:

• Puff ___
• Abacus user
• Relative of 1-Across
• Calculating snake?
• Venomous serpent
• Abacus wielder
• Columnist?
• Venomous reptile
• Sum finder
• Sort of snake
• Kind of viper
• Reptile that's really sumthing?
• Kind of snake
• Deadly viper
• "The Black ___" (first of a Rowan Atkinson Britcom series)