Crossword Genius

Undulation (4)


I believe the answer is:


'undulation' is the definition.
(I know that undulation can be written as wave)

This is the entire clue.

(Other definitions for wave that I've seen before include "may have a crest at the top?" , "Shake a hand in the air" , "Undulating curve" , "Move hand to and fro as greeting" , "60s cinematic movement with 1a [NEW]" .)

I've seen this clue in The Sun.
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