Well refuted! (3)
I believe the answer is:
ill
'well' is the definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for ill that I've seen before include "Faulty" , "Under the weather" , "state, briefly" , "Where Chicagoans are briefly" , "Infirm" .)