Rider in search of news (9)
I believe the answer is:
afterword
'rider' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see a link between them that I don't see?
'in search of news' is the wordplay.
'in search of' becomes 'after' (I've seen this in another clue).
'news' becomes 'word' (synonyms).
'after'+'word'='AFTERWORD'
Can you help me to learn more?
(Other definitions for afterword that I've seen before include "Epilogue" , "novel conclusion, perhaps" , "book end" , "I finish work" , "Final addition to book" .)