Crossword Genius

Aperture at the iris's centre (5)

Ross

I believe the answer is:

pupil

(Other definitions for pupil that I've seen before include "Learner in the eye?" , "Aperture in an eye" , "Schoolboy or eye part" , "Schoolchild; part of eye" , "Eye hole" .)

I've seen this clue in The Times.
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