Melanie has style (4)
I believe the answer is:
elan
'style' is the definition.
(synonyms)
'melanie has' is the wordplay.
'has' indicates the answer is hidden within the clue.
'ELAN' can be found hidden inside 'melanie'.
(Other definitions for elan that I've seen before include "Impressive and energetic style" , "Vigour, style, enthusiasm" , "French verve" , "Stylishness" , "Snap" .)