Rather than clearing all answers from the survey, (which you can learn how to do here,) you can delete indivudal participant's responses, including your own.

First, go to your project and select the Participants tab from the home/admin page.

From the Participants tab, scroll down until you see the Participants box. 

Click the x comment icon in the far right column of the participant's row to remove all responses from that individual. 

Related:
How can I remove all project responses and views

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