Related Clues:

• "Spring ahead" hrs.
• Summer letters
• "Spring ahead" letters
• Small poisonous snake, viper
• Mathematical reptile
• An arithmetic snake?
• An arithmetic snake
• Poisonous enough not to do any subtracting?
• Totter, perhaps, without any feet
• Even without feet it will get you up after half a century
• How dangerous for your ruddy father to get back!
• What the ruddy father is up to
• One's ruddy parent turns poisonous
• One that may put on not even one foot
• One might be made to dread being such a creep