Den supports fellow showing talent (5)
I believe the answer is:
flair
'talent' is the definition.
(flair is a kind of talent)
'den supports fellow' is the wordplay.
'den' becomes 'lair' ('lair' can be a synonym of 'den').
'supports' is a charade indicator (letters next to each other) (bottom letters provide a support for the top ones).
'fellow' becomes 'f' (abbreviation - of a society etc.).
'lair' after 'f' is 'FLAIR'.
'showing' is the link.
(Other definitions for flair that I've seen before include "Natural talent or panache" , "Natural talent and aptitude" , "skill" , "Creative brilliance" , "Stylish talent" .)