Crossword Genius

Express disapproval about a chore (4)

Ross

I believe the answer is:

task

I'm a little stuck... Click here to teach me more about this clue!

'a chore' is the definition.
(I know that chore can be written as task)

'express disapproval about' is the wordplay.
I cannot really see how this works, but
'about' could be 'a' (abbreviation in Chambers) and 'a' is found within the answer.
The remaining letters 'tsk' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for task that I've seen before include "Difficult piece of work" , "Allocate work" , "Job of work" , "something to do" , "Set piece of work" .)

I've seen this clue in The Guardian.
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