Brainy group (5)

I believe the answer is:

mensa

'brainy group' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for mensa that I've seen before include "High-IQ society" , "High IQ_organisation" , "Organisation for those with high IQs" , "Stars" , "High IQ society" .)

I've seen this clue in the Newsday, The Wall Street Journal and the USA Today.

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