Python has been around a lot longer than Clojure though, especially if you count years of it being used in production. Clojure has only started seeing wide use about 5 years ago.
The fact that it's already used successfully at large companies shows that it is an effective language. Most companies that try it end up sticking with it. So, I'm not really seeing a problem here to be honest.
Clojure was released 10 years ago with 1.0 officially announced 8 and 1/2 years ago. Clojure adoption has been stagnant for a few years now. 8 jobs in London after 10 years, IMHO, represents a serious adoption problem.
Python was released 26 years ago, and it certainly didn't have the ecosystem or the popularity it has today 16 years ago.
There are certainly more than 8 jobs in London for Clojure. JUXT https://juxt.pro/index.html alone hires more people than that. Maybe you're just looking in the wrong places.
The fact that it's already used successfully at large companies shows that it is an effective language. Most companies that try it end up sticking with it. So, I'm not really seeing a problem here to be honest.