Crossword Genius

Carbuncle or stye? (7)

Ross

I believe the answer is:

eyesore

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

This clue could be a double definition.

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

'stye?' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'or' is the link.

Can you help me to learn more?

(Other definitions for eyesore that I've seen before include "ugly feature" , "It's offensively ugly" , "Ugly and offensive sight" , "something one wouldn't want to see" , "it looks bad" .)

I've seen this clue in The Guardian.
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