Part of YSL (4)

I think it could be either:

Which length description are you looking for?:

7 4*

'part of ysl' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for yves that I've seen before include "Frenchman, so-called?" , "__ Saint Laurent, couturier, d. 2008" , "-- Montand (French actor)" , "French man" , "Montand, Fr. actor" .)

I've seen this clue in The New York Times and the LA Times.

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