One gives tender loving care, possibly (9)

I believe the answer is:

treasurer

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'one' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

I cannot understand how the remainder of the clue works.

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(Other definitions for treasurer that I've seen before include "Finance expert" , "Club official" , "Book-keeper" , "Manager of funds" , "Fund manager" .)

I've seen this clue in The Telegraph.

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