Crossword Genius

Old province boys (5)

Ross

I believe the answer is:

natal

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'old province' is the definition.
(former South African province)

I don't understand the rest of the clue.

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(Other definitions for natal that I've seen before include "Christmas is Jesus's -- day" , "Connected to birth" , "of births" , "of an ass?" , "Province at one time" .)

I've seen this clue in the Evening Standard.
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