Acting like any language that makes use of parentheses is a Lisp is similar to the Diogenes plucked chicken allegory. There are a lot of ways in which Clojure clucks like a chicken, to put it in terms of the metaphor. There is definitely room for a debate.

It's like calling Postscript meaningfully a Forth just because the syntax is superficially the same. There's certainly someone in this thread who could give a good thousand word comment on that.