CL has no ISO standard library for opening a TCP socket.
Clojure has no ISO standard library for opening a TCP socket.
I don't see the difference.
Usocket: Common Lisp socket library:
https://common-lisp.net/project/usocket/#implementations
Walled garden? I can make a native executable for Windows using any one of several Lisp implementations. No framework or VM or whatever required.
Clojure saves some people from programming the JVM in Java; good for them.
Clojure is a modern Lisp with the explicit goal of being a practical and pragmatic Lisp intended for getting real-world software engineering tasks done, not just a grand walled garden with beautiful and pure ideas but without standard libraries for stuff like, say, "opening a TCP socket".