Here are the steps on how to clear work for a specific student:
Go to 'My Classrooms'
Click 'Student work' button
Click 'Student List' view on the top left of the page
Find the student's name and click the 'Archive' icon at the end of the row
A notification will appear asking you to confirm:
Click OK. Then go to 'Grade New Work' and select 'View Archived Work'
Click the 'Student List' view. From there, you can delete all Connor's work by clicking the trash bin icon at the end of the row. To unarchive the work, just click the 'archive' icon beside the trash bin icon.