Crossword Genius

Post news, a conclusive piece (9)

Ross

I believe the answer is:

afterword

'a conclusive piece' is the definition.
(piece of writing at the end of a book)

'post news' is the wordplay.
'post' becomes 'after' (the prefix 'post-' means 'after').
'news' becomes 'word' (synonyms).
'after'+'word'='AFTERWORD'

(Other definitions for afterword that I've seen before include "I finish work" , "Final addition to book" , "book end" , "Concluding part of book" , "End matter" .)

I've seen this clue in The Guardian.
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