Clojure and ClojureScript are practically the same language. Both are "hosted", relying on Java and JavaScript for low-level things and providing clean interop

Clojure and ClojureScript are practically the same language. Both are "hosted", relying on Java and JavaScript for low-level things and providing clean interop for those things. So, I see no problem with learning either. Especially when you first jump in you are concerned more with the language "proper".