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The Clue
Like some editions (9 letter answer)
The Answer
ANNOTATED
Tags
Notes
The answer ANNOTATED is so rare that it appears less than once every 2500 puzzles.
Definition
ANNOTATE as a verb:
1. (annotate, footnote) = add explanatory notes to or supply with critical comments; "The scholar annotated the early edition of a famous novel"
2. (gloss, comment, annotate) = provide interlinear explanations for words or phrases; "He annotated on what his teacher had written"