Crossword Genius

Tighten your belt and behind -- adults are going to be slender (6)

Ross

I believe the answer is:

svelte

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'slender' is the definition.
(synonyms)

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(Other definitions for svelte that I've seen before include "Slim and stylish" , "Sylphlike" , "Slim or slender in a graceful way" , "Slender or sleek" , "Gracefully slim" .)

I've seen this clue in The Telegraph.
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