Dior fashionista's retro style (4)

I believe the answer is:

afro

I'm a little stuck... Click here to teach me more about this clue!

'style' is the definition.
(Afro is a type of hairstyle)

I cannot understand how the remainder of the clue works.

(Other definitions for afro that I've seen before include "Shock description" , "Tightly-curled 4 down" , "Big curly hairdo" , "Type of 18" , "Hair cut" .)

I've seen this clue in The Guardian.

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