Crossword Genius

Idly look through a book under a tree? (4)

Ross

I believe the answer is:

leaf

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But I can't explain it at all! Could you help me understand?

(Other definitions for leaf that I've seen before include "See 1" , "needed for making a longer table" , "Page of a book" , "following 28 [SILVER]" , "Page; piece of tree" .)

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