These tasks are out of one’s class (8)
I believe the answer is:
homework
'one's class' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe there's a link between them I don't understand?
'these tasks are out' is the wordplay.
'these tasks' becomes 'homeworks' (homework is a kind of task).
'are out' means to remove the last letter.
'homeworks' with its final letter taken away is 'HOMEWORK'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for homework that I've seen before include "School prep" , "Work done outside school" , "It's done outside school hours" , "DIY" , "Preparation before lesson" .)