One’s written on British poverty before beast died (10)
I believe the answer is:
blackboard
'one's' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for blackboard that I've seen before include "Teaching aid" , "where he might chalk up a win" , "something to write on" , "What's written on in the classroom" , "school equipment" .)