Isn't there more to power than that? For example, in clojure you can't change the binding of a function in a namespace after it has been compiled. In python or ruby you do have the power to do that.
I'm not a Clojure expert, so I can't directly address that, but from the little that I know of Clojure though, I think you can do that by binding a function to a var, and then changing the binding of the var. (Can any Clojure experts exlaborate?)
Regardless, every Lisp that I am able to comment on (newLISP, elisp, Scheme, CL) can do that easily, so I doubt that Clojure would have difficulty with this.
It does have difficulty with this, check the mailing list. Just because something using s-expressions doesn't mean you can override functions in a namespace.
