At the company I work for we've found it hard to find Clojure devs. Not sure if this applies everywhere else, but it's definitely seen as a disadvantage of the language here.
What can be more challenging is to find more senior people who are decent Clojurians (it is hard to take a junior developer and make them as, or more, senior than you, for example :-) ). Hiring experienced Clojure devs is also doable, but takes time, flexibility (e.g., open to remote... easier in 2020 than in 2019), and real effort.
People who already knew Clojure had a tendency to overcomplicate things with solutions that used every bit of their Clojure knowledge.
So I agree that it is harder for experienced people than for young kids fresh from school.
In my startup, our onboarding time is two weeks. I would say nine out of ten fresh graduates we hired picked up Clojure and were able to do something useful after two weeks. But we did have one or two persons who were not able to and they ended up in one of FAAG (yes, we did do leetcode style interviews, but only asked medium level questions).