Sophistication (8)

I think it could be either:

Which length description are you looking for?:

class

'sophistication' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for class that I've seen before include "School group" , "Genre" , "First-rate" , "Category; form" , "Stylish; lesson" .)

I've seen this clue in the Universal.

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