Crossword Genius

Vocalist's assistant (4)

Ross

I believe the answer is:

mike

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'vocalist's assistant' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

This is the entire clue.

Can you help me to learn more?

(Other definitions for mike that I've seen before include "Boy's name - November's predecessor" , "megaphone" , "letter in code" , "Boy's name; piece of recording equipment" , "T [Thespian] Reid" .)

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