OTOH Lisps like Emacs Lisp, Common Lisp, ISLisp, and some others are still carrying the core of the first Lisp. Basically you can run Lisp 1.5 code in those without many changes.
Just like Java is not the new C. OTOH languages like C++ and Objective C still support much of C. You can port C to C++ easily.
Over the history many other languages have been trying to replace Lisp: ML (functional programming), Dylan (object-oriented programming), Logo, Scheme, ... all tried to modernize/improve Lisp. Now it is Clojure and some other languages.
Still there are core Lisp languages which carry on the genes.
But not Clojure:
Clojure 1.5.0-RC2
user=> (car '(1 2))
CompilerException java.lang.RuntimeException: Unable to resolve symbol: car in \
this context, compiling:(NO_SOURCE_PATH:3:1)
user=> (append '(1 2) '(3 4))
CompilerException java.lang.RuntimeException: Unable to resolve symbol: append \
in this context, compiling:(NO_SOURCE_PATH:4:1)
user=> (assoc 'foo '((foo . 3)))
ArityException Wrong number of args (2) passed to: core$assoc clojure.lang.AFn\
.throwArity (AFn.java:437)
user=> (atom 'foo)
#<Atom@2285af04: foo>
Does not look like it supports Lisp processing as defined by McCarthy:
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.91....
Additionally the Java error messages are especially irritating. I enter Clojure code and get Java error messages.
Compare that with a real Lisp:
bash-3.2$ java -jar abcl.jar
Armed Bear Common Lisp 1.1.1
Java 1.7.0_25 Oracle Corporation
Java HotSpot(TM) 64-Bit Server VM
Low-level initialization completed in 0.628 seconds.
Startup completed in 1.968 seconds.
Type ":help" for a list of available commands.
CL-USER(1): (car '(1 2))
1
CL-USER(2): (append '(1 2) '(3 4))
(1 2 3 4)
CL-USER(3): (assoc 'foo '((foo . 3)))
(FOO . 3)
CL-USER(4): (bar 10)
#<THREAD "interpreter" {6EEE1E2}>: Debugger invoked on condition of type UNDEFINED-FUNCTI\
ON
The function BAR is undefined.
Restarts:
0: CONTINUE Try again.
1: USE-VALUE Specify a function to call instead.
2: RETURN-VALUE Return one or more values from the call to BAR.
3: TOP-LEVEL Return to top level.
[1] CL-USER(5):
Clojure may be a cool language, but the core of Lisp has been replaced in parts with something else. List processing is different. It's now based on 'persistent' lazy sequences...