Have a look at Spec and the design philosophy behind it if you are still interested in Clojure at all. Especially how Hickey feels about open specs, versioning,

Have a look at Spec and the design philosophy behind it if you are still interested in Clojure at all. Especially how Hickey feels about open specs, versioning, and names. It is a pretty opinionated stance to take on solving those issues, but it convinced me and I no longer have the worries you describe about the dynamic nature of a large Clojure system.