I was experimenting with integrated tools.namespace reloading in elisp as well, and I found a slightly nicer way to send commands to nrepl:

  (defun nrepl-reset ()
    (interactive)
    (nrepl-interactive-eval "(user/reset)"))

The original elisp function:

  (defun nrepl-reset ()
    (interactive)
    (set-buffer "*nrepl*")
    (goto-char (point-max))
    (insert "(user/reset)")
    (nrepl-return))