Crossword Genius

Eastern trees? Nonsense! (7)

Ross

I believe the answer is:

eyewash

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'nonsense' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

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(Other definitions for eyewash that I've seen before include "Nonsense (informal)" , "Visual cleansing agent - nonsense" , "Bunk" , "rot?" , "Nonsense; cleansing lotion" .)

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