Crossword Genius

Become less wrinkly (7)

Ross

I believe the answer is:

flatter

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'become' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

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(Other definitions for flatter that I've seen before include "sugar" , "drier" , "Comparatively deflated" , "Fawn upon" , "Become" .)

I've seen this clue in The Independent.
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