Crossword Genius

Iris may be behind it (6)

Ross

I believe the answer is:

eyelid

I'm a little stuck... Click here to teach me more about this clue!

'iris' is the definition.
(thesaurus)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for eyelid that I've seen before include "It blinks" , "Facial shutter" , "Batting membrane?" , "Skin over viewer" , "Ocular closer" .)

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