Being an extra in a film stands for feeling present but unimportant to the main plot. Dream books read it as a wish to be noticed, or relief at staying in the background.
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.