Crossword Genius

Eyesores with distinctive appearances left out (5)

Ross

I believe the answer is:

styes

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'eyesores' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for styes that I've seen before include "Eyelid swellings" , "Eye troubles" , "Problems seeing" , "Eye infections" , "gatherings" .)

I've seen this clue in the Irish Times.
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