Crossword Genius

Shake after medium's lost voice (6)

Ross

I believe the answer is:

treble

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'voice' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

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(Other definitions for treble that I've seen before include "Singer; in three parts" , "Chorister; multiply by three" , "Multiple score in darts" , "High boy's singing voice" , "High darts score" .)

I've seen this clue in The Times.
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