Jenson —, winner of the 2009 F1 World Drivers' Championship (6)

I believe the answer is:

button

(Other definitions for button that I've seen before include "Round fastener" , "Knob for fastening" , "bit of the mattress?" , "Disc for pushing, fastening" , "Tot bun up for a fastening device" .)

I've seen this clue in The Mirror.

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