[racket] How to make eval work on define?

Hi,

When I use eval on an S-Expression, where there are something like (define
len (...)), racket screams at me define: not allowed in an expression
context in: (define len (make-length 10))

My questions are:

   - How to make eval work on definition?
   - If eval is not designed to work on definitions, then is there some
   workarounds that can make it work?

I appreciate any help!

Thanks,

Monica
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