Cryptic crossword clue
Added comments from working at Eton and outside 9

The most common and most likely answer to this crossword clue is the 9 letter word ANNOTATED

I've seen this crossword clue in Independent
A
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Buddy explains!

The straight part
We know that "Added comments" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case added comments = annotated.
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 ANNOTATED mean?

ANNOTATED verb
  1. To add annotation to.
ANNOTATED adjective
  1. Contains or is accompanied by annotations or labelled notes.

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