>>1864
>>1866
It is a dialect though. Clojure is a Lisp-1 meaning that it does not allow the same name to be used for a function and a variable simultaneously. Lisp-2 is a different dialect, it's Common Lisp.
>>1903
No, you can program Lisp on a napkin with a pencil. As for modern Emacs, once you figure it out, it's an awesome IDE http://tuhdo.github.io/emacs-tutor.html especially if you're involved in code review and tests.
The reason Lisp isn't used by everybody is because it's too powerful, and Lisp hackers all make their own libraries so there's no ecosystem in place of standard libraries for industry to pluck from. Every single new language "feature" that comes out lately for hipster lang du jour is just reinvented Lisp, like Julia.
Racket is the best Lisp-1 going, it's maintainers and libraries are all being created by academics so quality code with quality standards, not haphazard java library nightmare or Lisp hackers all making different shit. Typed Racket is very robust for security applications and easy to rapidly prototype with