First non-medallist reportedly approaching with plenty to say (11)
I believe the answer is:
forthcoming
'with plenty to say' is the definition.
(forthcoming can mean eager to speak)
'first non-medallist reportedly approaching' is the wordplay.
'first non-medallist' becomes 'fourth' (a runner who comes fourth isn't given a medal).
'reportedly' indicates a 'sounds like' (homophone) clue.
'approaching' becomes 'coming' (synonyms).
'fourth' is a homophone of 'forth'.
'forth'+'coming'='FORTHCOMING'
(Other definitions for forthcoming that I've seen before include "Approaching" , "Communicative" .)