Inflamed swelling on eyelid (4)
I believe the answer is:
'inflamed swelling on eyelid' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for stye that I've seen before include "producing eyesore" , "swelling by organ" , "Climb" , "Ocular affliction" , "Eyelid affliction" .)