Style, vigour (4)

I believe the answer is:

elan

I believe this clue is a double definition.

'style' is the first definition.
(synonyms)

'vigour' is the second definition.
(I've seen this before)

(Other definitions for elan that I've seen before include "French flair" , "fizz" , "Bounce" , "Dashing style" , "Dash in France" .)

I've seen this clue in the Evening Standard.

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