[ Sorry for the delayed reply. ]

Ian Garmaise writes:

> According to the manual section 8.4.3, org-resolve-clocks should be
> bound to C-c C-x C-z
>
> This doesn't seem to be the case.

That's odd.  That binding has been around for a while (f250f6beb,
2012-07-28) and is in the version you reported to be running:

  $ git grep org-resolve-clocks 685b2c -- lisp/org-keys.el
  685b2c:lisp/org-keys.el:(declare-function org-resolve-clocks "org" (&optional only-dangling-p prompt-fn last-valid))
  685b2c:lisp/org-keys.el:(org-defkey org-mode-map (kbd "C-c C-x C-z") #'org-resolve-clocks)

Perhaps there's something in your configuration that's clobbering the
default binding.