Students of quality (5)

I believe the answer is:

class

I believe this is a double definition.

'students' is the first definition.

'quality?' is the second definition.
(class is a kind of quality)

'of' is the link.

(Other definitions for class that I've seen before include "Category; lesson" , "Rank" , "sort" , "Body of students" , "Study group" .)

I've seen this clue in the Evening Standard and The Globe and Mail.

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