Possible Clues:

• Have to include acceptable yen as Asian capital
• Capital trashed by Godzilla
• Japanese city moving up to capital
• Play about king having nothing as capital
• Stereotypical monster's target
• Godzilla's ''stomping'' grounds
• ... also eating edges of kidney — capital!
• Eastern state's capital has also taken over south-eastern state
• City once called Edo
• Capital that's also in Kentucky? On the contrary