Is there a way to eval a symbol without selecting it?

No, but you can add a custom command to do it

First, run "Chlorine: Open Config". Then, on that file, type:

(defn eval-symbol []
  (p/let [contents (editor/get-var)]
    (editor/eval-and-render contents)))

Save the file - you'll get a new command "Chlorine: Eval Symbol"