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Comedian gets someone to attract punters to show (6)

Ross

I believe the answer is:

barker

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'comedian' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for barker that I've seen before include "One stands at a carnival giving loud, colourful, sales talk" , "setter, perhaps" , "Loud showman and dog" , "Tout" .)

I've seen this clue in The Times.
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