Possible Clues:

• Socket filler
• Sphere of vision
• Watch the dance in which one has a pupil
• 'You can see with this!', I shout to the auditor
• Observe closely
• Stare at
• Mix it with whisky, soda and ice, as they say in the East End
• Watch dance in which one has pupil
• Optical organ
• Sounds, you see, as if I make a lot of it