Crossword Genius

They fall annually (6)

Ross

I believe the answer is:

leaves

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'they' is the definition.
Both the definition and answer are plural nouns.
Maybe they are linked in a way I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for leaves that I've seen before include "They are found on trees and in books" , "See 14" , "Departs with what fall in the Fall" , "''... of Grass'' (Walt Whitman)" , "Foliage - goes away" .)

I've seen this clue in the Evening Standard.
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