Crossword Genius

Perhaps a cockney chicken: we hear one shouting (6)

Ross

I believe the answer is:

yeller

'one shouting' is the definition.
(someone shouting or yelling out)

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

(Another definition for yeller that I've seen is " one making a lot of noise".)

I've seen this clue in The Guardian.
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