Talk about something thrown at Ponders End (7)
I believe the answer is:
discuss
'talk about' is the definition.
(to discuss something is to talk about it)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for discuss that I've seen before include "Settle" , "Debate" , "Talk about (something)" , "Consider" , "Go into" .)