Some nasty experience, that localised inflammation (4)
I believe the answer is:
stye
'inflammation' is the definition.
(I've seen this before)
'some nasty experience that' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'STYE' is hidden in the letters of 'nasty experience that'.
'localised' is the link.
This may not be right. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for stye that I've seen before include "producing eyesore" , "makes viewer sore" , "Infected swelling of the eye" , "Eyelid problem" , "Eyelid sore" .)