Doesn't eat greenstuff (6)

I believe the answer is:

leaves

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'doesn't eat' is the definition.
(I've seen this before)

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

(Other definitions for leaves that I've seen before include "They are found on trees and in books" , "Departs with what fall in the Fall" , "Departs with tree growths" , "Pour hot fat over (meat)" , "Abandons" .)

I've seen this clue in The Globe and Mail.

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