Crossword Genius

She's said to be slimmer (4)

Ross

I believe the answer is:

lena

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'she's' is the definition.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for lena that I've seen is " River of Siberia (4400 km), the world's ninth longest".)

I've seen this clue in the Evening Standard.
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