Young leader in wild set makes painful sight (4)

I believe the answer is:

stye

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'painful sight' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'young leader in wild set' is the wordplay.
'leader' says to take the initial letters.
'in' is an insertion indicator.
'wild' indicates an anagram.
The first letter of 'young' is 'y'.
'set' anagrammed gives 'ste'.
'y' put within 'ste' is 'STYE'.

'makes' acts as a link.

Can you help me to learn more?

(Other definitions for stye that I've seen before include "Red eye" , "Ocular affliction" , "Ocular inflammation" , "makes viewer sore" , "Infection on the edge of the eye" .)

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

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