Melanie has dash (4)
I believe the answer is:
elan
'dash' is the definition.
(I know that dash can be written as elan)
'melanie has' is the wordplay.
'has' indicates a hidden word.
'ELAN' is hidden in the letters of 'melanie'.
(Other definitions for elan that I've seen before include "Stylishness" , "Panache - ardour" , "fizz" , "Stylish elegance" , "Dash in Paris" .)