Crossword Genius

What might give you an irritated look? (9)

Ross

I believe the answer is:

eyestrain

But I can't explain it at all!

(Other definitions for eyestrain that I've seen before include "Possible effect of too much reading" , "Stress on mince pies (in the East End)?" , "puts pressure on pupils" , "Discomfort of sightseers" , "pupils are involved in such trouble" .)

I've seen this clue in The Times.
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