Energy, style, and enthusiasm (4)
I believe the answer is:
elan
I believe this clue is a double definition.
'energy' is the first definition.
(thesaurus)
'style and enthusiasm' is the second definition.
(I've seen this before)
(Other definitions for elan that I've seen before include "French dish in lane" , "Dashing style" , "Vitality" , "Stylish elegance" , "fizz" .)