Centre of a wheel (3)

I believe the answer is:

hub

'centre of a wheel' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for hub that I've seen before include "Centre of activity" , "Focal point of activity" , "Centre of wheel" , "Central part of a car wheel" , "throbbing heart" .)

I've seen this clue in The Telegraph and the Evening Standard.

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