Possible Clues:

• It's not all my eye, but it sounds all banal and more so
• Sounds like I bit this to make it more grainy, by the sound of it
• Eye tissue
• Part of 41-Across
• Eyeball part
• Transparent part of the coat of the eyeball
• Time to leave musical instrument with Academy that's near the pupil
• Covering of eyeball
• It's not all my eye, but sounds more trite
• Pupil's protection