"Inviting Intelligence" group (5)

I believe the answer is:
mensa
'inviting intelligence 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 "Organisation for the clever" , "High IQ_organisation" , "High-IQ organisation" , "High IQ society" , "High-IQ society" .)