Teen entrant I’m playing for fun (13)
I believe the answer is:
entertainment
'fun' is the definition.
(thesaurus)
'teen entrant i'm playing' is the wordplay.
'playing' indicates an anagram.
'teen'+'entrant'+'im'='teenentrantim'
'teenentrantim' with letters rearranged gives 'ENTERTAINMENT'.
'for' is the link.
(Other definitions for entertainment that I've seen before include "Recreation activity" , "Source of amusement" , "Diversion for one's leisure time" , "show business" , "Diverting activity" .)