Related Clues:

• It's often closed for the night
• Egyptian leader distributed yield from pupil's cover
• Open's one's eyes perhaps to me, say, on cover
• Batted body part
• Facial shutter
• Firm to earn differently from what's in front of one's eye
• Reportedly, I come across cover for 6 down ¿ it needs to be closed
• Lash holder
• It closes at night
• It may be coveredin shadow
• Eyeball membrane
• Pupil's hidden behind this
• Old jokes perhaps, each one seen through by pupil
• Clear front layer of eye
• Situation that's tricky, not right, with a part of the eye