Something painful on Observer's cover? (4)
I believe the answer is:
stye
'cover?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for stye that I've seen before include "Eye sore" , "Infection on the edge of the eye" , "dump" , "Animal pen" , "Climb" .)