Crossword Genius

Undulation (6)

Ross

I think it could be either:

Which length description are you looking for?:

4

6

ripple

'undulation' is the definition.
(I know that ripple is a type of oscillation)

This is the entire clue.

(Other definitions for ripple that I've seen before include "A small wave, or a gentle sound as of laughter" , "Slight surface wave" , "Small wave on a liquid's surface" , "undulation" , "Small wave or surface disturbance" .)

I've seen this clue in the Evening Standard.
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