I'm not sure I'd say "recommended" but I'd probably start with deadgrep

I am using rgrep currently, never tried deadgrep

But i would like to use lsp

I think lsp would have to implement that, just like it does for re-frame. Consider asking this question in #lsp

I did not know that thisi is already possible for re-frame. I will take s look, thanks for tip.

Yes, this is because clj-kondo has built-in support for re-frame. But finding references for namespaced keywords works in general