Base error about prophet (4)
I believe the answer is:
seer
'prophet' is the definition.
(both can mean someone who tells the future)
'base error about' is the wordplay.
'about' indicates the answer is hidden within the clue (the clue goes around or about the answer).
'SEER' is hidden within 'base error'.
(Other definitions for seer that I've seen before include "Fortune-teller" , "Person who can read the future" , "Prophet or visionary" , "He forecasts" , "Person with unusual powers of foresight" .)