Clocks were once stopped at the hour of a death, so a stopped clock is read as time frozen at a moment of loss or shock. It suggests part of you is still standing at that hour.
Has this come up in your dreams before? What was going on in your life then?
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.