Brad —, New Zealand lock; 2011 Rugby World Cup Final winner (5)

I believe the answer is:

thorn

(Other definitions for thorn that I've seen before include "Invariable accompaniment of 2, they say" , "Plant spine; old letter" , "Woody prickle" , "Prickly plant" , "sharp object" .)

I've seen this clue in The Mirror.

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