SQLJet is an independent pure Java implementation of a popular SQLite database management system. SQLJet is a software library that provides API that enables Java application to read and modify SQLite databases.SQLJet does not support SQL queries; there is an API to work with the database on a lower level.
This might be easier to use from Clojure than having to use a JDBC driver and making sure the SQLite binaries are installed. However, not having SQL queries is a significant drawback for some applications.
By the way, this sounds like a good JDBC driver for SQLite: