"Functional programming" is one of the most ambiguous and misunderstood terms in software.

If you ask someone coming from ML or Haskell, Scala is more "FP" than Clojure.

If you ask someone coming from Lisp, Clojure is more "FP" than Scala.

Ultimately, it doesn't matter what you call it. Pick your tools based on what they do, not on what other people call them.