Are best corrected by scolds (7)
I believe the answer is:
berates
'scolds' is the definition.
('berate' can be a synonym of 'scold')
'are best corrected' is the wordplay.
'corrected' indicates an anagram.
'are'+'best'='arebest'
'arebest' with letters rearranged gives 'BERATES'.
'by' acts as a link.
(Other definitions for berates that I've seen before include "Scolds" , "Upbraids" , "is a scold" .)