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Champion, uptight inside, has to get going (7)

Ross

I believe the answer is:

actuate

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'get going' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for actuate that I've seen before include "Switch on" , "Spark off" , "Put into action" , "Inspire" , "trip?" .)

I've seen this clue in The Guardian.
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