Can we use IntelliJ for Clojure ? I read somewhere we need some paid plugin to use that ?
There are some free plugins now I think, but I use Cursive, which is free for non-commercial licence, but not for commercial. It's really good though, and worth paying for I think. cursive
Two plugins that aren't Cursive that are actively maintained: • https://github.com/afucher/clojure-repl-intellij • https://github.com/clojure-lsp/clojure-lsp-intellij I'm not their user, but AFAICT they complement each other so it might make sense to use both.
See also #cursive and #clojure-repl-intellij channels if you want to ask more specific questions about each.