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' indicates a hidden word.
'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" .)