Leader of newspapers (9)
I believe the answer is:
editorial
This might be a double definition.
'leader' is the first definition.
(type of newspaper article)
'of newspapers' is the second definition.
The definition suggests a singular noun which matches the answer.
Can you help me to learn more?
(Other definitions for editorial that I've seen before include "Article written" , "bit of paper" , "Newspaper article giving the editor's opinions" , "paper item" , "Paper's opinion piece" .)