Crossword Genius

Chief supplier to Spooner (6)

Ross

I believe the answer is:

leader

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

I don't understand how the remainder of the clue works.

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(Other definitions for leader that I've seen before include "Chief or front man" , "Important (newspaper) article" , "important member of orchestra" , "Principal player in an orchestra" , "Guide; editorial" .)

I've seen this clue in The Independent.
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