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