Gabbana ultimately beaten for style (4)
I believe the answer is:
afro
'style' is the definition.
(I have seen 'Style of haircut' mean 'afro' so perhaps 'style' could also mean 'afro')
'gabbana ultimately beaten for' is the wordplay.
'ultimately' says to take the final letters.
'beaten' indicates an anagram.
The final letter of 'gabbana' is 'a'.
'for' with letters rearranged gives 'fro'.
'a'+'fro'='AFRO'
(Other definitions for afro that I've seen before include "Shock description" , "Type of 18" , "Of hair style, tightly curled and bushy" , "little Malian, for example" , "Big hairstyle" .)