Crossword Genius

Make good your sins an hour after midday? (5)

Ross

I believe the answer is:

atone

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

'make good' is the definition.
(I've seen this before)

'your sins an hour after midday?' is the wordplay.
I cannot really understand how this works, but
'an' could be 'one' and 'one' is located in the answer.
The remaining letters 'at' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for atone that I've seen before include "Recompense" , "Expiate" , "Pay the price" , "In agreement - sounds singular" , "remedy" .)

I've seen this clue in The Telegraph, The Times, The Sun and The Independent.
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