Clojure is not really an option when you do systems programming, such as writing native apps, command line tools, working on small devices like a Pi, etc. There are many things I'm exploring in C++ for which Clojure is just not a good tool for the job.
But also, there are some really great C++ libraries in the areas of physics and graphics, and there is no equivalent of the in Java I could use.
There are a few Clojure-inspired Lisps that are meant to be suitable for writing command line apps. I'm trying to work on one myself in fact (https://github.com/sdegutis/Paladin), with the main goal being that it's written entirely in C and has 0 (required) external dependencies -- both goals having been inspired by the implementation and design of Lua. But I'm no expert at implementing languages so it's coming along slowly.
But also, there are some really great C++ libraries in the areas of physics and graphics, and there is no equivalent of the in Java I could use.