You can exclude the check from the For Review tab to get rid of it and get you back to working order. Let me walk you through the steps.
In your QuickBooks Online, click Banking from the left menu.
Select the appropriate bank account.
In the For Review tab, put a checkmark on the check that was already cleared.
Click the Batch actions drop-down, then choose Excluded Selected.
Once done, the check transaction will be listed on the Excluded tab. If you want to delete it, you can go to the Excluded tab and select the transaction, then choose Delete from the Batch actions drop-down.