Crossword Genius

Shoot somebody clever (4)

Ross

I believe the answer is:

whiz

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'shoot' is the definition.
(thesaurus)

I don't understand the rest of the clue.

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(Other definitions for whiz that I've seen before include "Swish" , "Move rapidly" , "chap with a remarkable talent" .)

I've seen this clue in The Sunday Times and The Times.
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