Answer: In just a few steps!
Don't forget! deleting an assignment will remove it from the accounts of all students to whom you had previously distributed it.
If you still want to go ahead:
- Open Handouts and log in as a teacher.
- Tap on the class for which you want to delete the assignment(s).
- Long tap on the assignment you want to delete.
- Tap on 'Delete' when prompted.
And the assignment in question will magically disappear from your class!