Possible Clues:

• You can view Venus with it
• Yankee Doodle heartlessly played with absence of instruments
• Observer simply reviewing Yankee Doodle: 'Gutless'
• Badly need a key to one way of looking at things
• Natural vision
• With which one looks helpless?
• Yankee upset over writer having the ability to see without glasses
• Minimalist stargazing tool
• Human sight without any aid
• Seeing the vision without any outside interference, Yankee upset over writer