High IQ society (5)

I believe the answer is:

mensa

'high iq society' is the definition.
(I've seen this before)

This is all the clue.

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

I've seen this clue in The Times.

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