Genuine person certain to succeed? (7)

I believe the answer is:

natural

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'certain to succeed?' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for natural that I've seen before include "Not man-made; off-white" , "Uncultivated" , "Unaffected - innate" , "Unaffected - musical note" , "Without affectation" .)

I've seen this clue in The Irish Times.

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