Related Clues:

• Perhaps summer for an adder for 20 across walk
• About to fall for an adder, perhaps
• Perhaps it's the adder, not having legs, cannot even do this
• An adder can't, not having feet
• Being without feet, no adder can even do this
• Is an adder just about to fall?
• Sounds as if an adder may be about to fall
• An adder may fall after it does this
• 'Having no feet, an adder can't even do this (6)'
• Start to fall for an adder?
• 'The adder can't even do this, having no feet (6)'
• 'An adder, having no feet, cannot walk even as badly as this (6)'
• At last the broken tree will wobble
• Might one add it all up and then fall for it
• Before the fall one gets to the summer