Romance languages including style (4)
I believe the answer is:
elan
'style' is the definition.
(I know that style can be written as elan)
'romance languages including' is the wordplay.
'including' says the answer is hidden in the clue.
'ELAN' can be found hidden inside 'romance languages'.
(Other definitions for elan that I've seen before include "Vivacity, dash" , "Dashing style" , "Dash and enthusiasm." , "spirit" , "Panache - ardour" .)