Student group with quality (5)
I believe the answer is:
class
This clue is a double definition.
'student group' is the first definition.
(I've seen this in another clue)
'quality' is the second definition.
(class is a kind of quality)
'with' is the link.
(Other definitions for class that I've seen before include "Opportunity to learn" , "Kind" , "showing stylish excellence" , "First-rate" , "sort" .)