It's even poetic in its brevity (3)

I believe the answer is:

een

I'm a little stuck... Click here to teach me more about this clue!

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

I cannot understand how the remainder of the clue works.

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

Want a hint initially instead of a full solution? Install my app