A hidden lair is read as a private refuge or a place where plans are made away from view. Dream books see it as your need for a space nobody else can enter.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.