Crossword Genius

One of the options in laundering pounds initially is about to dip (3-5)

Ross

I believe the answer is:

pre-rinse

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'one of the options' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'in laundering pounds initially is about to dip' is the wordplay.
I cannot quite see how this works, but
'in' is found in the answer.
'about' could be 're' ('re' means regarding or about) and 're' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Irish Times.
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