Wavering effect in music (7)

I believe the answer is:

tremolo

'wavering effect in music' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for tremolo that I've seen before include "Musical shake" , "Paganini's effect" , "Unsteady effect" , "Vibrato effect" , "effect of repeated bowing" .)

I've seen this clue in The Independent, The Sun and The Times.

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