Small disturbance on water (6)

I believe the answer is:

ripple

(Other definitions for ripple that I've seen before include "A small wave, or a gentle sound as of laughter" , "Light ruffle on the surface" , "Edgar Allan ---, US author" , "Type of ice cream with coloured syrup" , "Slight disturbance on water's surface" .)

I've seen this clue in The Guardian.

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