Related Clues:

• Barely able to walk, one might add
• Might be too old to get through Dublin like this
• One might add up to getting near the fall
• The sort of adder that may fall for this
• Almost too old to get through Dublin
• The adder, having no feet, can hardly walk
• Perhaps it's the adder that's not 11 across
• Adder has no feet, so it can hardly walk
• He will just about make it to the total
• Old Man River can barely run through Dublin
• Might it be an adder that's beginning to fall for this?
• Almost fall for an adder-upper
• Runs through Dublin, though it can barely walk
• An adder upper might be about to fall for this
• Going to fall for an adder upper, perhaps