Possible Clues:

• Make progress on short legs on back of cot or bunk
• Walk south of road junction reveals rubbish
• Does one go like a duck after tea? What nonsense!
• If it loses its head it'll go like a duck - such nonsence!
• Beginning to walk like a duck? Nonsense!
• Hot air temperature accompanies graceless walk
• Rear of corpulent to move in ungainly way? Nonsense
• What nonsense to go like a duck at last!
• Time to imitate a duck? Nonsense!
• Model with a gait that makes no sense