Cryptic crossword clue
A literary supplement? 8

The most common and most likely answer to this crossword clue is the 8 letter word ADDENDUM

I've seen this crossword clue in The Guardian
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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 ADDENDUM mean?

ADDENDUM noun
  1. Something to be added; especially text added as an appendix or supplement to a document.
  2. A postscript.
  3. The height by which the tooth of a gear projects beyond (outside for external, or inside for internal) the standard pitch circle or pitch line.

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