Crossword Genius

What you may need to print or redo, retracting blunders (5,9)

Ross

I believe the answer is:

toner cartridge

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

'need to print or redo retracting blunders' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'what you' is the wordplay.
I cannot really understand how this works, but
'you' could be 'one' (I've seen this before) and 'one' is found within the answer.
This explanation may well be incorrect...

'may' is the link.

Can you help me to learn more?

I've seen this clue in The Sunday Times.
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