To be in on a secret (5)
I believe the answer is:
privy
(Other definitions for privy that I've seen before include "Party to secret knowledge - outside loo" , "John" , "Outside lavatory" , "sort of councillor" , "bog" .)
I believe the answer is:
privy
(Other definitions for privy that I've seen before include "Party to secret knowledge - outside loo" , "John" , "Outside lavatory" , "sort of councillor" , "bog" .)