Crossword Genius

If it's not a white material it's green (4)


I believe the answer is:


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'it's green' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

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(Other definitions for lawn that I've seen before include "Smooth grass garden in front of house" , "Fine cotton or smooth grass" , "Garden feature" , "Cultivated and mown grass" , "Fine fabric" .)

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