You could do worse than learning modern php. Esp. if you have some experience with it and as long as you are ready to leave bad habits behind. (Going for a full stack framework might help here by more or less forcing you to do things the right way.)
As far as jobs are concerned you can't go wrong with PHP. Clojure jobs are virtually non-existent outside London and even in London Clojure they are scarce. As far as Indeed.co.uk goes even Rails is pretty thin on the ground outside the capital. PHP, JS and Java, on the other hand, are a bag of tricks you can take anywhere and always find work. Keep Clojure for your own projects.
