Just as with the word "developer" [1], I'm beginning to think that the word "refactor" is a dirty word. Are we even talking about the same activity? How is it people are alternately claiming that Haskell and Clojure (virtual opposites on the language spectrum) are infinitely superior to each other at the same thing?
Wikipedia defines it as "the process of restructuring existing computer code without changing its external behavior", which sounds about right, but it's also so completely generic that it could mean almost anything.
Claiming that Clojure can't do 'meaningful refactoring' sounds to me about like claiming that Kanji is bad for transcribing Welsh, or that sign language doesn't work well for audiobooks. They're technically languages but the fundamentals are so different that all the comparisons are talking right past each other.
The style of refactoring that one does in Haskell (disclaimer: it's been many years since I've written any) is not really possible in Clojure, but it's not really necessary, either.