It's apt to become attached to you, naturally (3)

I believe the answer is:

bur

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If this is the answer, I'm afraid I cannot explain it.

(Other definitions for bur that I've seen before include "Clinging seed case" , "Seed-case" , "Prickly seed case" , "sticker" , "small drill" .)

I've seen this clue in the Evening Standard.

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