Possible Clues:

• Voyeur
• Gent with pipe, nasty old male who likes looking at females
• Cat that sounds like a little bird: I see, but I shouldn't
• One who looked as no other did
• One needs cat's eyes!
• One who spies on others
• Lady Godiva spotter
• Spy blowing whistle perhaps on test that's coming up
• Illegal voyeur
• Spy one-time GP playing on piano