Armani at the outset 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')
'armani at the outset beaten for' is the wordplay.
'at the outset' suggests taking the first letters.
'beaten' is an anagram indicator.
The initial letter of 'armani' is 'a'.
'for' with letters rearranged gives 'fro'.
'a'+'fro'='AFRO'
(Other definitions for afro that I've seen before include "Hairstyle with tight curls" , "Big hair?" , "Bushy hairstyle" , "Hairstyle adopted by the young Michael Jackson" , "One cut" .)