I agree. I read through Clojure for the Brave and True, and played with it a bit, but it was too much new stuff at once coming from an only Python background.
I'm reading Structure and Interpretation of Computer Programs right now and everything is clicking. I'm looking forward to going back to Clojure after I get through more of SICP.
Many people say that clojure is the one that clicked for them, but I suspect it's really not due to clojure itself, just that it's more recent and likely not to be the first lisp people have tried to learn.
I think the exposure of trying to learn different lisps is the key, and when you get to a point where one clicks, run with it!
I'm reading Structure and Interpretation of Computer Programs right now and everything is clicking. I'm looking forward to going back to Clojure after I get through more of SICP.