Evil bishop redacted from account (3)
I believe the answer is:
ill
'evil' is the definition.
(I've seen this in other clues)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for ill that I've seen before include "Where to find Chicago" , "Unwell from bacillus" , "reduced state" , "Badly diminished" , "Valetudinarian" .)