Dodgy dealer bowling top people over (4)

I believe the answer is:

spiv

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'dodgy dealer' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for spiv that I've seen before include "Shady dealer" , "Flashily dressed dodgy dealer" , "Flashy rogue" , "Black market operator" , "Flashy black-marketeer" .)

I've seen this clue in The Times.

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