Payer regarding Spooner's dividend (11)

I believe the answer is:

remunerator

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

'payer' is the definition.
(I know that payer can be written as remunerator)

'regarding spooner's dividend' is the wordplay.
I cannot really understand how this works, but
'regarding' could be 're' (re can mean regarding, concerning) and 're' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Guardian.

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