Crossword Genius

Speaker using some words on a rota system? (6)

Ross

I believe the answer is:

orator

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'speaker' is the definition.
(orator is a kind of speaker)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for orator that I've seen before include "He addresses" , "He lectures" , "Skilled public speaker" , "A gifted public speaker" , "he can talk" .)

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