What a cleaner may do to get higher pay around the financial centre (5)

I believe the answer is:

rinse

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'what a cleaner' is the definition.
(thesaurus)

I don't understand how the rest of the clue works.

(Other definitions for rinse that I've seen before include "Sluice" , "Swill out" , "Flush" , "Use water to remove soap" , "Wash without using soap" .)

I've seen this clue in the Evening Standard.

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