About Edgar getting knocked out in the ring (9)
I believe the answer is:
regarding
'about' is the definition.
(I've seen this before)
'in the ring' is the wordplay.
'in the' becomes 'regar' (I am not sure about this - if you are sure you should believe this answer much more).
'ring' becomes 'ding' (dinging is a kind of ringing).
'regar'+'ding'='REGARDING'
'edgar getting knocked out' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for regarding that I've seen before include "Thinking" , "Concerned with" , "With respect to" , "Seeing" , "Considering" .)