Take another look at the sentence:

If you offer Valerie a piece of watermelon, she will refuse it, the slices look like the wicked smile of a circus clown who once scared her as a child during a trip to the big top.

The blank space between clown and who is completely correct. The slices look like the wicked smile of a circus clown is a main clause. Who once scared her begins a relative clause. When a relative clause follows a main clause, as in the example above, you generally do not use punctuation.

Go back to the sentence to try again.

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