Crossword Genius

Microphone initially grasped by idle singer? (7)

Ross

I believe the answer is:

domingo

I'm a little stuck... Click here to teach me more about this clue!

'singer?' is the definition.
(I know that Domingo is a tenor)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for domingo that I've seen before include "Placido ......., one of the Three Tenors" , "Santo -, capital of Dominican Republic" , "Placido --, opera singer" , "Placido ... is popular tenor" .)

I've seen this clue in The Guardian.
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