Top quality (2,4)

I think it could be either:

Which length description are you looking for?:

2,4

de luxe

(Other definitions for de luxe that I've seen before include "Very high quality (2.4)" , "Very luxurious or elegant" , "(Of products) superior quality" , "rich and elegant" , "top model?" .)

I've seen this clue in The Guardian.

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