Of a secret society (7)
I believe the answer is:
masonic
'of a secret society' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for masonic that I've seen before include "Type of lodge" , "Ma's coin (anag.)" , "Branch of secret male society" , "Like some lodges" , "Type of handshake" .)