Style, enthusiasm (4)
I believe the answer is:
elan
I believe this is a double definition.
'style' is the first definition.
(I know that style can be written as elan)
'enthusiasm' is the second definition.
(I know that elan is a type of avidity)
(Other definitions for elan that I've seen before include "Stylish elegance" , "Energetic style - anagram of 3" , "Flamboyance" , "Impetuosity - style" , "French verve" .)