Trouble in sight (4)

I believe the answer is:

stye

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'trouble in sight' is the definition.
The definition and answer can be both states of affairs as well as being singular nouns.
Maybe they are linked in a way I don't understand?

This is the entire clue.

Can you help me to learn more?

(Other definitions for stye that I've seen before include "Inflammation around the eye" , "Eye sore" , "Tamworth residence" , "nasty spot" , "Inflammation on eyelid" .)

I've seen this clue in The Globe and Mail.

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