Keep talking about poet’s end? This one’s was tragic (10)

I believe the answer is:
chatterton
'poet's end? this one's was tragic' is the definition.
The definition suggests a singular noun which matches the answer.
'keep talking about' is the wordplay.
I cannot quite understand how this works, but
'talking' could be 'chat' (I've seen this before) and 'chat' is present in the answer.
'about' could be 'on' (as in a book 'on' a certain topic) and 'on' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for chatterton that I've seen before include "Tragic young poet" , "marvellous boy" , "English poet" .)
