The most common and most likely answer to this crossword clue is the 8 letter word  CORRECT
I've seen this crossword clue in The Guardian
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Buddy explains!
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does  CORRECT mean?
 CORRECT adjective- Free from error; true; accurate.
- With good manners; well behaved; conforming with accepted standards of behaviour.
- To make something that was wrong become right; to remove error from.
- (by extension) To grade (examination papers).
- To inform (someone) of their error.
- To discipline; to punish.