Clever enough to get good marks and top study group (6)

I believe the answer is:

astute

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

I cannot understand how the rest of the clue works.

(Other definitions for astute that I've seen before include "Shrewd, canny" , "Wide" , "Shrewd and clever" , "Clever and canny" , "smart (with some self-interest?)" .)

I've seen this clue in the Sydney Morning Herald.

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