Crossword Genius

Chief trader exchanging diamonds for pounds (6)

Ross

I believe the answer is:

leader

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

I cannot understand how the rest of the clue works.

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(Other definitions for leader that I've seen before include "Editorial - chief" , "Ruler" , "Opinion piece; boss" , "Head (of government, etc)" , "Front-runner or head of group" .)

I've seen this clue in The Times.
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