In Common Lisp it'd be:

  (funcall (funcall (funcall (funcall ; ...

...though I don't think that functions which return functions which return functions which return functions ad infinitum are a great idea. Simply taking a value and returning a value means you can use a pipelining operator:

  (~> some-data
    function-1
    function-2
    (function-3 _ some-other-data)
    ; ...
    function-n)