Looking at LinkedIn or indeed.com with just a simple search for Clojure with no geographic qualifier (in the US), we see a very small number of listed openings - 252 over the last month at LinkedIn or 44 in the last 14 days at indeed. A plain google job search on Clojure jobs in the US returns an even smaller number.
Some of those job listings will almost certainly have Clojure listed as part of a "laundry list" of technologies and the actual job will probably not be Clojure oriented.
So just from a raw numbers perspective, the job sites to suggest that there aren't a huge number of opportunities. Comparatively speaking, there are like 60,000 Java job postings on LinkedIn in the last month.
However, if you attend a Clojure/conj (one of the "primary" Clojure programming conferences), you will find that many attendees are part of some (not super-large?) number of companies that use Clojure.
My best advice on building a Clojure career (that I failed to follow) is that a programmer who wants to make a Clojure career path is to be prepared to spend a significant amount of time trying to make connections inside the Clojure community. On top of that, you probably need to build a portfolio of project experience that you at minimum blog about and preferably speak at Clojure conferences, user groups, or meetups.
<edit: removed off-topic thought>
I would gently observe that long-time Clojure developers are maybe too close to the tree to see the forest when it comes to judging Clojure career opportunities.
But I would love to be wrong about my impression of Clojure job opportunities! Perhaps fellow-HN readers could post (anonymous?) numbers of Clojure job openings for their company to give us a better idea?
But, usually better to weight technology quite low when picking what to work on. Product and company culture has much bigger impacts on your quality of life in my opinion.
I don't want to work with Spring, TYPO3, or OOUI, and all of those things have made me sad in the past. But, I really don't want to work at a company where people micro-manage, run around like headless chickens, get stressed at each-other, schedule endless meetings, or where the product is something pointless that no-one wants. Any of that stuff is bad.
Your mileage may vary, and I don't think the language is for everyone, but it is very satisfying to work with and it's putting groceries on the table for lots of people. (I'm happy to discuss more; contact info is in my profile.)
(luckily, extra mile != extra 100 miles)