It's even used by poets (3)

I believe the answer is:

een

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'it's even' is the definition.
(synonyms)

I don't understand the rest of the clue.

(Other definitions for een that I've seen before include "Even, poetically" , "Literary form of even" , "Even to the poet" , "Poetic form of even" .)

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

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