Talk about being second in Olympic event (7)
I believe the answer is:
discuss
'talk about' is the definition.
(to discuss something is to talk about it)
'second in olympic event' is the wordplay.
'second' becomes 's' (common abbreviation).
'in' means one lot of letters goes inside another.
'olympic event' becomes 'discus' (I've seen this before).
's' inserted inside 'discus' is 'DISCUSS'.
'being' is the link.
(Other definitions for discuss that I've seen before include "Debate" , "Settle" , "Go into" , "Take up" , "Talk about (something)" .)