Crossword Genius

Many unnatural shocks for kingpin (6)

Ross

I believe the answer is:

bigwig

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'for kingpin' is the definition.
(synonyms)

I cannot understand how the rest of the clue works.

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(Other definitions for bigwig that I've seen before include "What may lie ahead largely" , "'Chief, top banana (6)'" , "Important person (slang)" , "Important person, with large, bald head?" , "important figure" .)

I've seen this clue in The Sun.
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