This package adds Clojure(Script) syntax checker (via Joker) to flycheck.
The package is available on Melpa:
M-x package-install flycheck-joker
Then add the following to your init.el:
(require 'flycheck-joker)
Make sure Joker binary is on your path. Joker version 0.9.7 or greater is required. See Joker installation instructions for details.
Please read about Joker's linter mode to understand its capabilities and limitations. Specifically, it's important to configure Joker to reduce false positives.
Please see examples of the errors Joker can catch here