Reprimand for wrongness did badly (8,4)
I believe the answer is:
dressing down
'reprimand' is the definition.
(I have seen 'Severe reprimand' mean 'dressing-down' so perhaps 'reprimand' could also mean 'dressing-down')
'wrongness did badly' is the wordplay.
'badly' indicates anagramming the letters.
'wrongness'+'did'='wrongnessdid'
'wrongnessdid' is an anagram of 'DRESSING-DOWN'.
'for' acts as a link.
(Other definitions for dressing down that I've seen before include "carpeting" , "Severe scolding (wearing casual clothes?)" , "Severe reprimand" , "using low gear?" , "Maybe not wearing a tie in the office" .)