Possible Clues:

• It's used to examine 27 ac
• Device for one sense to intrude on another?
• Ear-viewing instrument
• So to turn up and manage the ears
• That'll help you hear here
• Can a mixture of soot manage your ears?
• To cope so clumsily with medical instrument
• A mixture of soot may manage to deal with the ear
• Bits of soot you'll manage to get in your ear
• Returning so, to manage something that can see the drum