Possible Clues:

• Structure in a children's song
• It's falling down, in song
• Capital game, one removed to Arizona
• Structure on the River Thames
• It allows us to make capital transfers between banks
• Capital feature collapsing in children's rhyme
• Thames crossing of nursery rhyme
• Subject of a nursery rhyme that has only eight different words
• Bending old or new spanner
• American writer game to see Thames landmark