If wrong, indeed, is challenged (6)
I believe the answer is:
defied
'is challenged' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for defied that I've seen before include "Openly refused to obey" , "Stood up to" , "Was disobedient to" , "Refused ot obey, confronted" , "Challenged or braved" .)