The most common and most likely answer to this crossword clue is the 7 letter word ENDNOTE
I've seen this crossword clue in Financial Times
E
N
D
N
O
T
E
More clues leading to the result ENDNOTE
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 ENDNOTE mean?
ENDNOTE noun- An annotation placed at the end of a document or chapter of a document.