Lisp is a family of languages.
Common Lisp is an ANSI standard that is huge. Think C++ huge. Don't use it as a script language.
Unless you are targeting fairly hardcore programmers, Lisp as a scripting language is going to be...er....not well taking. Probably. Lua is likely a better bet as a script language.
That said, a Lisp is fine(technically) for implementing a scripting language.