Clenched fists are traditionally read as held-back anger or a resolve gathered tight. The dream often points to a tension the day did not let you put down.
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.