Possible Clues:

• Obvious; jump over
• Plain clothes originally used by foolish king
• Transparent - free of obstruction
• Open vault
• It's not a bit thick for the king to be playful after a century
• Transparent and lucid
• It's obvious that the new sound of this will be powerful
• Defibrillator's yell
• Open; not cloudy
• Certain weather forecast