Poetic "always” (3)
I believe the answer is:
eer
'poetic always' is the definition.
(poetic or archaic version of 'ever')
This is all the clue.
(Other definitions for eer that I've seen before include "Ever to the poet (3)." , "Before, poetically speaking (1'2)" , "Always (poetic)" , "Ever poetically" , "Always (poetical)" .)