Imaginary instrument played to rock (3,6)

I think it could be either:

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3,6

air guitar

(Other definitions for air guitar that I've seen before include "Instrumental object that's non-existent" , "Imaginary instrument played by rock fans!" , "Just imagine playing this" , "Imaginary stringed instrument" , "Imaginary instrument that one pretends to play" .)

I've seen this clue in The Mirror.

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