Way bad person gets nothing right — officer to step in? (9)
I believe the answer is:
moderator
'officer to step in?' is the definition.
(someone who steps in or mediates)
'way bad person gets nothing right' is the wordplay.
'way' becomes 'mode' (synonyms).
'bad person' becomes 'rat' (rat can mean a dishonourable person).
'gets' is a charade indicator (letters next to each other).
'nothing' becomes 'O' (looks like zero - 0).
'right' becomes 'r' (common abbreviation).
'mode'+'rat'+'o'+'r'='MODERATOR'
(Other definitions for moderator that I've seen before include "Judge" , "Presbyterian minister - superintendent of university examinations" , "One presides over a forum or debate" , "Overseer of exam" , "Site foreman" .)