One of the big features of Clojure is you can't changes variables after they are initialized - in java terms, they are all final. However, when the let exits, the buffer variable is out of scope, so the StringBuilder object can be gc'd if that's what you're concerned about. Inside the let, you can have another let, with a variable even with the same name, but it's really a different variable and only active within that inner scope. Note, = is a function that tests equality, like == or .equals() in java, it's not assignment. If you explain more about what you want to do, someone might be able to offer more advice.
-Mike
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