Answer: privy

AnswerCrossword Clue
PRIVYKind of council or seal
privyan outhouse (an outside toilet) / private (secluded from the sight, presence or intrusion of others)
privyhaving knowledge of something private
privyoutdoor toilet
PRIVYSecret: arch.
PRIVYA party (to)
PRIVYIn on something
PRIVYOutbuilding
PRIVYKind of seal
PRIVY... to (informed)
PRIVYSecret
PRIVYCertain kind of council
PRIVYIn secret.
PRIVYSecretly aware.
PRIVYOuthouse
PRIVYWhere you might go
PRIVYLav
PRIVY... to (in on)
PRIVYIn on, with "to"
PRIVYInvolved in, with "to"