To a viewer, something inflammatory (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
stye
If this is the answer, I'm afraid I cannot explain it.
Can you help me to learn more?
(Other definitions for stye that I've seen before include "Swelling near the eye" , "Eyelid affliction" , "Ocular affliction" , "Climb" , "It pains viewer" .)