Melanie has flair (4)
I believe the answer is:
elan
'flair' is the definition.
(I know that flair 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 "Dash and enthusiasm." , "Vigour, style, enthusiasm" , "Vitality" , "Dash, style" , "Stylishness" .)