Melanie has style (4)
I believe the answer is:
elan
'style' is the definition.
(I know that style can be written as elan)
'melanie has' is the wordplay.
'has' says the answer is hidden in the clue.
'ELAN' is hidden in the letters of 'melanie'.
(Other definitions for elan that I've seen before include "Impressive and energetic style" , "Vigour, style, enthusiasm" , "French verve" , "Stylishness" , "Snap" .)