Crossword Genius

Home visitor whose charges are small? (10)

Ross

I believe the answer is:

babysitter

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'home visitor' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe there's an association between them I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for babysitter that I've seen before include "Childminder" , "One left in charge" .)

I've seen this clue in The Times.
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