Scheme like question

Hi

apologies for the stupid question. I was reviewing some teaching material and looked at the following Scheme (form SICP) code about "streams".

(define (integral integrand initial-value dt) (define int (cons-stream initial-value (add-streams (scale-stream integrand dt) int))) int)

The question is how you'd rendered it in Common Lisp or how you would provide some macrology to mimic the inner define. I know this has been asked before... I am sure somebody knows the answer.

All the best