That's more of a Lisp problem than a Clojure problem. All the Expert Lisp Programmers settled on Emacs many moons ago (as in decades past) and no one has bothered to write another (good) Lisp-friendly text editor since. And well, you can't really write Lisp without a suitable text editor, so all the Lisp neophytes either give up or learn to cope with emacs and eventually forget about replacing it.
all the Lisp neophytes either give up or learn to cope with emacs and eventually forget about replacing it.
This is really not true any more. LightTable is great for beginners, and there are more options for Clojure now. I'm developing Cursive, which is becoming pretty popular - Vim also seems to work well, Counterclockwise is good too.
Even before that, it's shocking how few text editors have basic Lisp indentation and REPL support.
I guess I did forget about Light Table (as AFAIK it doesn't support Scheme or Common Lisp yet), which seems like the right thing to point beginning Clojure programmers to.
Hell, that's probably a big part of why Clojure became more popular than the previous Lisps.