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No, you cannot clear your return since you have already filed. You can remove or change information in your TurboTax account by clicking Intuit Account at the top of the Online program screen after signing onto the account. Click on Account Settings. Edit any information in both Profile & Security.
You can also deactivate your account but you will need to contact TurboTax support.
Click on the following website to contact TurboTax support -
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.