Provincial boys (5)

I believe the answer is:

natal

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'provincial' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for natal that I've seen before include "description of delivery" , "Brazilian port" , "Concerned with the birth" , "of births" , "former SA province" .)

I've seen this clue in the Evening Standard.

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