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Entertainer heard to choose an entrance (7)

Ross

I believe the answer is:

picador

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'entertainer' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe there's an association between them I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for picador that I've seen before include "The bullfighter who goads the animal" , "Riding bullfighter" , "Horseman in bullring" , "Mounted bullfighter with a lance" , "Lancer" .)

I've seen this clue in The Mirror and The Daily Express.
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