What George was, at soccer? (4)

I believe the answer is:

best

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'soccer?' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe you can see an association between them that I can't see?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for best that I've seen before include "Most excellent; outwit" , "Most outstanding" , "Peerless" , "The most talented" , "BOSOM] ?" .)

I've seen this clue in the Evening Standard.

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