Crossword Genius

Waves used to make other waves (7)

Ross

I believe the answer is:

rollers

I'm a little stuck... Click here to teach me more about this clue!

'used to make other waves' is the definition.
(rollers make hair wavy)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for rollers that I've seen before include "expensive cars" , "Long heavy sea waves" , "They may be used to paint" .)

I've seen this clue in The Guardian.
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