Many unnatural shocks for kingpin (6)
I believe the answer is:
bigwig
'for kingpin' is the definition.
(synonyms)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(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" .)