Top fashion designer? (8)

I believe the answer is:

milliner

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'top fashion designer?' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?

This is all the clue.

Can you help me to learn more?

(Other definitions for milliner that I've seen before include "Women's hat maker" , "Maker of women's hats" , "trader" , "Garment maker" , "Hat-maker" .)

I've seen this clue in The Sun.

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