Crossword Genius

Pretend to play two different but identical notes (4)

Ross

I believe the answer is:

mime

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'play two different but identical notes' is the definition.
'mime' can be an answer for 'play' (miming is a kind of playing). I'm unsure of the 'two different but identical notes' bit.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for mime that I've seen before include "Silent actor" , "Theatre with no speech" , "Express something with actions and gestures alone" , "Act without speaking" , "Performance without words" .)

I've seen this clue in The Times.
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