One who cherishes the person holding the purse strings? (9)

I believe the answer is:

treasurer

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'one who cherishes the person holding the purse strings?' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

This is the entire clue.

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(Other definitions for treasurer that I've seen before include "Financial controller" , "Official in charge of finances" , "Fiscal officer" , "One of main officers of a society" , "one safeguarding funds" .)

I've seen this clue in The Times.

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