Style and vigour (4)
I believe the answer is:
elan
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">style and vigour</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for elan that I've seen before include "French flair" , "Dash in France" , "Vitality" , "Flair and dash" , "Stylishness" .)