High-IQ organisation (5)

I believe the answer is:

mensa

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

This is the entire clue.

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

I've seen this clue in The Times.

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