Important person seen at the fairground (3,5)

I believe the answer is:

big wheel

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'important person' is the definition.
(I know that big wheel is a type of important person)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for big wheel that I've seen before include "Fair experience" , "Fairground attraction - important person" , "going round in London" , "Fairground ride" , "Amusement as London Eye" .)

I've seen this clue in The Daily Express.

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