Clojure has its own very effective strategy for multi-threading, and it is not the actor model. The language is built for concurrency and much careful language design was tailor-made for the challenges on modern threaded applications. Rich Hickey investigated the actor model considerably, and decided on a different model. In the core language, you have the choice of using its normal futures/threads with highly efficient and lock-free data structures, or using core.async, which is a model like Go channels. The latter is particularly popular in the community and generally the recommended approach.
Clojurescript offered the first and still (in my opinion) best option for hot reloading via "figwheel" which nearly all Clojurescript developers use. It automatically updates the UI as you code it.
Clojure, on the server, being a proper lisp with a real REPL, lets you poke and inspect and reload parts of the running program with no recompile cycle. A typical workflow there is to reload individual expressions or functions in the context of the running program to alter behavior as you develop.
Clojurescript offered the first and still (in my opinion) best option for hot reloading via "figwheel" which nearly all Clojurescript developers use. It automatically updates the UI as you code it.
Clojure, on the server, being a proper lisp with a real REPL, lets you poke and inspect and reload parts of the running program with no recompile cycle. A typical workflow there is to reload individual expressions or functions in the context of the running program to alter behavior as you develop.