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Bankers from Poughkeepsie, in their chopper, coming to peak (4)

Ross

I believe the answer is:

apex

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'to peak' is the definition.
(synonyms)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for apex that I've seen before include "reasonable fare" , "Point or summit" , "The highest point of something" , "Uppermost point" , "Summit - pinnacle" .)

I've seen this clue in The Independent.
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