Eyelid swelling (4)
I believe the answer is:
stye
'eyelid swelling' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for stye that I've seen before include "Ocular affliction" , "Eyelid sore" , "producing eyesore" , "Tamworth residence" , "Eyelid affliction" .)