A broker is read as a go-between, someone who handles a deal you cannot reach directly. Dream books link it to relying on others to speak for you, and to questions of whose interest they serve.
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.