Endless talk about throwing event (6)
I believe the answer is:
discus
'throwing event' is the definition.
(track and field event)
'endless talk' is the wordplay.
'endless' means to remove the last letter.
'talk' becomes 'discuss' (I've seen this before).
'discuss' with its final letter taken off is 'DISCUS'.
'about' acts as a link.
(Other definitions for discus that I've seen before include "Round object thrown in sport" , "Athletics field event" , "Debate" , "Olympic field event" , "Throwing plate" .)