Possible Clues:

• After half a century it would not be right in water
• A little creature left without cash
• How the new T gets left at last
• Even with one little foot, 'e is all right in the water
• If it's under fifty it's left
• Might 'e have only one foot left at last?
• Most of what's left in the water
• Most of what's left is amphibious
• One foot eastward by water
• After half a century abandoned in the water