A cuckoo clock stands for time announcing itself, routine and reminders that pop up at set moments. Dream books link it to awareness of deadlines and cycles.
When this appeared in your dream, what were you feeling?
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.